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1
Rooms, John Frederick. "A matrix isolation investigation of tellurium crochemistry using hydrogen telluride and tellurium dimers as precursors". Thesis, University of Hull, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419789.
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Ruscitti, Oliver P. "Beiträge zur Tellur-Stickstoffchemie sowie zu Verbindungen des Tellurs mit Halogenen und Pseudohalogenen". Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3187.
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Ruscitti, Oliver P. "Beiträge zur Tellur-Stickstoff-Chemie sowie zu Verbindungen des Tellurs mit Halogenen und Pseudohalogenen". [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963032313.
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Espinosa, Ortiz Erika. "Bioreduction of selenite and tellurite by Phanerochaete chrysosporium". Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1193/document.
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Le sélénium et le tellurium partagent des propriétés chimiques communes et appartiennent à la colonne des éléments chalcogènes de la classification périodique des éléments. Ces métalloïdes ont des propriétés physico-chimiques remarquables et ils ont été utilisés dans un grand nombre d'applications dans le domaine des hautes technologies (électronique, semi-conducteurs, alliages). Ces éléments, qui se retrouvent généralement sous formes d'oxyanions, sont extrêmement solubles dans l'eau et présentent une forte toxicité. Leur libération dans l'environnement est donc d'un enjeu capital. Différentes méthodes physico-chimiques ont été développées pour la récupération de ces metalloïdes, en particulier pour le sélénium. Néanmoins, ces méthodes requièrent un équipement lourd et couteux et ne sont pas très recommandables sur le plan écologique. Le traitement biologique est donc une bonne alternative pour la récupération de Se et de Te provenant des effluents pollués. Cette approche réside dans la bioréduction des différents oxyanions sous formes métalliques. Ceux-ci sont moins toxiques et d'intérêts commerciales notables surtout lorsqu'ils se présentent sous forme nanométrique. L'utilisation de micro-champignons comme microorganismes catalyseur de la réduction de Se et de Te a été démontrée dans cette étude. La réactivité du champignon responsable de la pourriture blanche, Phanerochaete chrysosporium en présence de sélénite et de tellurite a été évaluée, ainsi que son application potentielle pour le traitement des eaux contaminées et la production de nanoparticules. La présence de Se et de Te a une influence importante sur la croissance et la morphologie du champignon. Il s'avère que P. chrysosporium est très sensible à la présence de sélénites. La synthèse de Se° et de Te° sous forme de nanoparticules piégées dans la biomasse fongique a été observée, ainsi que la formation de nano-composites Se-Te lorsque le champignon était cultivé simultanément en présence des deux métalloïdes. L'usage potentiel de biofilm fongiques pour le traitement des effluents semi-acides (pH 4.5) contenant du Se et du Te a été suggéré. De plus, le traitement en mode continu de sélénite dans un réacteur à biofilm fongique granulaire a été évalué. Le réacteur a montré un rendement d'élimination du sélénium en régime permanent de 70% pour differentes conditions opératoires. Celui-ci s'est montré efficace pendant une période supérieure à 35 jours. La bonne sédimentation du biofilm granulaire facilite la séparation du sélénium de l'effluent traité. L'utilisation du biofilm granulaire contenant du sélénium élémentaire comme bio-sorbant a également été étudiée. Cet adsorbant hybride s'est montré prometteur pour l'immobilisation du zinc présent dans les effluents semi-acides. La plupart des recherches effectuées se sont focalisées sur l'utilisation des biofilms granulaires. Toutefois, la croissance du champignon suite à l'exposition à des concentrations différentes de sélénites a également été étudiée. Des micro-électrodes à oxygène et un microscope confocal à balayage laser ont été utilisées pour évaluer l'effet du sélénium sur la structure des biofilms fongiques. Quel que soit le mode de croissance de P. chrysosporium, le mécanisme de réduction du sélénite semble être toujours le même tout en menant à la formation de sélénium élémentaire. Cependant, l'architecture des biofilms et l'activité en oxygène sont influencées par la présence de séléniumSelenium (Se) and tellurium (Te) are particular elements, they are part of the chalcogens (VI-A group of the periodic table) and share common properties. These metalloids are of commercial interest due to their physicochemical properties, and they have been used in a broad range of applications in advanced technologies. The water soluble oxyanions of these elements (i.e., selenite, selenate, tellurite and tellurate) exhibit high toxicities, thus their release in the environment is of great concern. Different physicochemical methods have been developed for the removal of these metalloids, mainly for selenium. However, these methods require specialized equipment, high costs and they are not ecofriendly. The biological treatment is a green alternative to remove Se and Te from polluted effluents. This remediation technology consists on the microbial reduction of Se and Te oxyanions in wastewater to their elemental forms (Se0 and Te0), which are less toxic, and when synthesized in the nano-size range, they can be of commercial value due to their enhanced properties. The use of fungi as potential Se- and Te-reducing organisms was demonstrated in this study. Response of the model white-rot fungus, Phanerochaete chrysosporium, to the presence of selenite and tellurite was evaluated, as well as their potential application in wastewater treatment and production of nanoparticles. The presence of Se and Te had a clear influence on the growth and morphology of the fungus. P. chrysosporium was found to be more sensitive to selenite. Synthesis of Se0 and Te0 nanoparticles entrapped in the fungal biomass was observed, as well as the formation of unique Se-Te nanocomposites when the fungus was cultivated concurrently in the presence of Se and Te. Potential use of fungal pellets for the removal of Se and Te from semi-acidic effluents (pH 4.5) was suggested. Moreover, the continuous removal of selenite in a fungal pelleted reactor was evaluated. The reactor showed to efficiently remove selenium at steady-state conditions (~70%), and it demonstrated to be flexible and adaptable to different operational conditions. The reactor operated efficiently over a period of 35 days. Good settleability of the fungal pellets facilitated the separation of the selenium from the treated effluent. The use of elemental selenium immobilized fungal pellets as novel biosorbent material was also explored. This hybrid sorbent was promising for the removal of zinc from semi-acidic effluents. The presence of selenium in the fungal biomass enhanced the sorption efficiency of zinc, compared to Se-free fungal pellets. Most of the research conducted in this study was focused on the use of fungal pellets. However, the response of the fungus to selenite in a different kind of growth was also evaluated. Microsensors and confocal imaging were used to evaluate the effects of selenium on fungal biofilms. Regardless of the kind of fungal growth, P. chrysosporium seems to follow a similar selenite reduction mechanism, leading to the formation of Se0. Architecture of the biofilm and oxygen activity were influenced by the presence of selenium
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Guéry, Guillaume. "Elaboration et optimisation de verres tellurites pour des applications de gain Raman". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00868798.
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L'expansion de nouvelles technologies et la demande incessante d'une transmission d'informations plus rapide font que les systèmes de télécommunications nécessitent plus de débit sur de plus longues distances. L'amplification optique et notamment l'amplification optique par effet Raman représente une intéressante possibilité à repousser les limites de distance et de debit.Les verres à base d'oxyde de tellure sont des matériaux prometteurs pour les applications d'amplification optique par effet Raman; en particulier grâce à leurs fortes propriétés optiques linéaires et non linéaires, leurs fenêtres de transparence allant dans le proche et milieu infra-rouge du spectre de transmission. De plus, leurs propriétés thermiques et en particulier leurs faibles temperatures de transition vitreuse permettent une facilité de fibrage. L'estimation de l'intensité du gain Raman et sa zone spectrale mise en jeu sont généralement approchées à partir du spectre de diffusion Raman spontanée du matériaux. La compréhension des relations existantes entre la structure vitreuse, la réponse vibrationnelle et les propriétés d'optique non linéaire, représente un point clé au développement et à l'optimisation des verres de tellure pour l'amplification Raman. Cette dissertation apporte une réponse détaillée à la question fondamentale de l'étude doctorale: "Quel est l'impact de la structure vitreuse sur les propriétés d'amplification Raman dans les verres d'oxyde de tellure?"
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Bucella, Teresa. "Sviluppo di un banco prova per la caratterizzazione sperimentale di un sistema di recupero termico basato su generatori termoelettrici". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
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L’attualità del settore tecnologico e le potenzialità dei generatori termoelettrici sono stati il punto di partenza per condurre un approfondimento mirato alla caratterizzazione sperimentale dei 6 moduli a base di bismuto di tellurio e di modello TEG2-126LDT. È stata effettuata un’analisi preliminare dei moduli in modo da comprendere al meglio condizioni operative, potenzialità, proprietà termoelettriche, parametri caratteristici e approfondire il principio di funzionamento della generazione termoelettrica.
Per la raccolta dei dati sperimentali è stato allestito un banco prova che si compone di una struttura di supporto, quattro elementi riscaldanti collegati in parallelo per simulare la sorgente di calore, due ventole per il raffreddamento ad aria e Arduino Mega 2560 come sistema di acquisizione delle misure di temperatura e tensione. Le misure di interesse sono state effettuate attraverso il modulo DC0-25V per la tensione generata da ogni modulo in regime di carico disaccoppiato e le termocoppie di tipo “K” per la misura delle temperature sul lato riscaldato e raffreddato del TEG. Il modello di TEG analizzato è impiegato nella conversione di calore alle basse temperature, cioè fino a 200°C a cui corrisponde una tensione a vuoto generata pari a 8.6 V.
Sulla base delle curve caratteristiche ottenute è stato calcolato il coefficiente di Seebeck. L’analisi sperimentale è stata approfondita a sua volta ricercando i parametri prestazionali, ossia il valore della figura di merito ZT e dell’efficienza di conversione del calore in potenza elettrica. I risultati ottenuti attestano le scarse efficienze raggiunte dai generatori termoelettrici che attualmente non presentano caratteristiche competitive nella sostituzione dei principali sistemi di produzione dell’energia.
Si è ipotizzato infine il funzionamento dei moduli nella condizione più favorevoli, cioè di massima generazione di tensione quando è applicata una differenza di temperatura pari a 170°C.
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Cui, Sho. "Synthesis and characterization of tellurium based glasses for far infrared sensing and thermoelectric applications". Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S155/document.
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Les verres de tellures sont des matériaux récemment remis au goût du jour pour des applications en optiques. Certaines compositions permettent en effet de transmettre la lumière loin dans l’infrarouge au-delà de 20 µm, mais leur tendance naturelle à recristalliser rend difficile la fabrication d’objet pour la photonique telle que des fibres optiques. Des verres du système Te-Ge-Se ont été développés dans le cadre du projet Darwin de l’Agence Spatiale Européenne permettant de détecter la bande d’absorption du CO2 à 15 µm. La première fibre optique monomode a été obtenue à partir d’une nouvelle méthode de fabrication de préforme par moulage. Les verres de tellure du système Te-Ge-AgI sont les seuls à ne pas présenter de pic de cristallisation en analyse thermique. Leur stabilité a été mise à profit pour développer des fibres optiques avec un niveau très bas de pertes optiques, de l’ordre de 3 dB∙m-1, ce qui constitue un record. Ces fibres ont été utilisées pour mettre en œuvre des expériences de spectroscopie par ondes évanescentes permettant d’accéder à une gamme de longueurs d’onde encore jamais atteinte de 2 à 16 µm. Ce gain sera de première importance pour la mise en service de ces fibres en biologie ou médecine.Par ailleurs, les verres de tellure sont les verres présentant les conductivités électroniques les plus élevées jamais mesurées. Il s’agit donc de matériaux potentiellement intéressants pour la thermoélectricité. Certaines compositions du système (Te/Se)-(As/Sb/Bi)-(Cu/Ag) ont été synthétisées et caractérisées. Des matériaux composites obtenus par broyage et compression de poudres de verre et de Bi0.5Sb1.5Te3 cristallisé ont été préparés. Ces derniers présentent un ZT = 0.365 à 413 K, ce qui est encourageant pour l’avenirThe tellurium-based glasses are of interest because of their transparency in the mid- and far-infrared range. Tellurium-based glasses and optical fibers can be used for the detection the atmosphere of terrestrial planets in Darwin project and the identification of chemical species in the daily life. For the detection of CO2 (15 µm) on exoplanet, high purity Te-Ge-Se experimental single mode fiber which can transmit light up to 16 μm has been successfully fabricated based on a new preform molding process. Moreover, Te-Ge-AgI glasses, which present no crystallization peak and far infrared transmittance beyond 30 μm (as bulk), are also candidates for infrared sensing. A structural model proposed in this work provides some explanations on their good thermal stability. Low-loss single index fibers drawn from these glasses have shown their capabilities to collect mid-infrared spectra from 2 to 16 µm. To the best of our knowledge, it is the first fiber evanescent wave spectra collected on such a wide range. This achievement will be essential for future medical applications.Otherwise, tellurium-based glasses, due to the intrinsic poor thermal conductivity and high Seebeck coefficient, are good candidates as new materials in the thermoelectricity field. Te-As-Se-Cu glass with the introduction of copper up to 25% has been explored. By sintering this glass with Bi0.5Sb1.5Te3, glass-ceramic composites were also obtained exhibiting maximum zT values equal to 0.365 at 413 K
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Buchanan, Christopher Taylor. "From Telluric (Earth) To Tectonic (Sky)". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32447.
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My graduate thesis is a study of telluric and tectonic architecture. These two ideas inspired me to design a baseball stadium for the town of Blacksburg, Virginia that portrayed the contrasting concepts "of the earth" and "of the sky."Master of Architecture
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Mal, Joyabrata. "Microbial synthesis of chalcogenide nanoparticles". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1136/document.
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Ces dernières années ont vu un intérêt croissant pour l'application de nanoparticules de chalcogénure (IP) (par exemple Se, Te) dans divers secteurs industriels, y compris l'énergie, les aciers, le verre et le raffinage du pétrole. Le chalcogénure métallique fluorescent (par exemple CdSe, CdTe) NPs sont utilisés dans les cellules solaires, les capteurs optoélectroniques et aussi dans le domaine de la biologie et de la médecine pour l'imagerie ou de détection comprenant biolabelling. En outre, en raison de la forte toxicité des oxyanions chalcogènes (à savoir, sélénite, séléniate, tellurites et tellurate), leur libération dans l'environnement est très préoccupante. Ainsi, mettre l'accent a été donné dans cette thèse sur le développement d'un nouveau procédé de synthèse microbienne des NPs chalcogénures en combinant le traitement biologique des eaux usées Se / Te contenant avec biorecovery de Se / Te sous la forme de Se / Te chalcogénures NPs.Une attention particulière a été accordée pour étudier l'effet des métaux lourds (par exemple Cd, Zn et Pd) co-contaminants sur bioréduction sélénite par anaérobie granulaire boues. boue anaérobie granulaire capable de réduire sélénite de séléniure de, en présence de Cd a été enrichie pour la synthèse microbienne de CdSe IP. Il était évident que lorsque Cd est présent avec sélénite, soit il forme un complexe de Se-Cd par adsorption sur biogène Se (0) des nanoparticules après EME-oxyanion ou bioréduction il réagit avec le séléniure aqueux (HSe-) pour former CdSe. Les spectres d'absorption et de fluorescence de la phase aqueuse à confirmer la présence de CdSe IP dans la phase aqueuse. spectroscopie Raman et X-ray spectroscopie de photoélectrons (XPS) analyse l'appui de cette constatation. La formation d 'une couche alliée de CdSxSe1-x à l'interface entre le noyau et CdS CdSe shell dans la boue a également été observée. Des études détaillées sur les substances polymères extracellulaires (EPS) révèlent que la teneur en protéines et en polysaccharides comme augmenté dans les EPS extraites de boues enrichi tandis que les substances humiques comme diminué. chromatographie d'exclusion de taille (SEC) des EPS révèle en outre une empreinte distincte pour les protéines et les substances humiques-like, avec une augmentation de haute teneur en protéines comme poids moléculaire et l'apparition de nouveaux pics pour les substances humiques comme dans les EPS après l'enrichissement.Anaérobie des boues lit granulaire (UASB) à courant ascendant a été utilisé pour la première fois pour le retrait continu de tellurite des eaux usées synthétique et la récupération du Te comme biogénique Te (0). La spectroscopie aux rayons X à dispersion d'énergie (EDS), diffraction des rayons X (XRD) et analyse spectroscopique Raman de la biomasse a confirmé le dépôt de Te (0) dans la biomasse. Il était évident que la majorité du Te (0) a été piégé principalement dans l'EPS entourant la biomasse, qui peut être facilement séparé par centrifugationRecent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs) (e.g. Se, Te) in various industrial sectors including energy, steels, glass and petroleum refining. The fluorescent metal chalcogenide (e.g. CdSe, CdTe) NPs are used in solar cells, optoelectronic sensors and also in the field of biology and medicine for imaging or sensing including biolabelling. Moreover, due to the high toxicity of chalcogen oxyanions (i.e., selenite, selenate, tellurite and tellurate), their release in the environment is of great concern. Thus, emphasize was given in this thesis on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te-containing wastewaters with biorecovery of Se/Te in the form of Se/Te chalcogenides NPs.A special focus was given to study the effect of heavy metal (e.g. Cd, Zn and Pd) co-contaminants on selenite bioreduction by anaerobic granular sludge. Anaerobic granular sludge capable of reducing selenite to selenide in the presence of Cd was enriched for the microbial synthesis of CdSe NPs. It was evident that when Cd is present along with selenite, it either forms a Se-Cd complex by adsorption onto biogenic Se(0) nanoparticles after Se-oxyanion bioreduction or it reacts with aqueous selenide (HSe-) to form CdSe. The absorption and fluorescence spectra of the aqueous phase confirm the presence of CdSe NPs in the aqueous phase. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis support this finding. The formation of an alloyed layer of CdSxSe1-x at the interface between the CdSe core and CdS shell in the sludge was also observed. Detailed studies on the extracellular polymeric substances (EPS) reveal that the protein and polysaccharide-like content increased in the EPS extracted from enriched sludge while humic-like substances decreased. Size exclusion chromatography (SEC) of EPS further reveals a distinct fingerprint for proteins and humic-like substances, with increase in high molecular weight protein-like and the appearance of new peaks for humic-like substances in the EPS after the enrichment.An upflow anaerobic granular sludge bed (UASB) reactor was used for the first time for continuous removal of tellurite from synthetic wastewater and the recovery of Te as biogenic Te(0). Energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopic analysis of biomass confirmed the deposition of Te(0) in the biomass. It was evident that the majority of the Te(0) was trapped predominantly in the EPS surrounding the biomass, which can be easily separated by centrifugation
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Günther, Anja. "Tellurringe als Elektronenpaardonoren in Clusterverbindungen und Koordinationspolymeren". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-78513.
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Durch diese Arbeit konnten einerseits neuartige sowie bereits bekannte molekulare Tellurringe in Clusterverbindungen und quasi-eindimensionalen Koordinationspolymeren erhalten werden. Die Stabilisierung der zyklischen, homonuklearen Einheiten erfolgt dabei stets durch die Koordination an elektronenreiche Übergangsmetallatome, wobei die koordinierenden Telluratome gegenüber diesen als Zwei-Elektronendonoren fungieren.
Die molekularen Clusterverbindungen [M(Te10)](TeX4)2(TeX3)2 (M = Rh, Ir X = Cl, Br) sowie [Ru2(Te10)](TeI4)2(TeI2)2 beinhalten eine übergangsmetallstabilisierte, neutrale Te10-Einheit, wobei jedes Übergangsmetallatom zusätzlich zwei terminale Halogenidotelluratliganden koordiniert. Im neuartigen, zehngliedrigen (Te04Te+0,54Te2)-Fragment finden sich zwei nahezu linear umgebende Telluratome, die als "Tellurbrücke", zwei gefaltete Te4-Ringe zur Vervollständigung der tricyclo[5.1.1.13;5]-Einheit koordinieren. Die Bindungssituation der nahezu linearen Te3-Sequenzen im homonuklearen Fragment sowie die [X-Te-X]-Sequenzen der Halogenidotelluratliganden lassen sich mit 3c4e-Bindungen verstehen. Anhand quantenchemischer Rechnungen konnte die Mehrzentrenbindung sowie die Aussage eines übergangsmetallstabilisierten Fragments bestätigt werden. In den inkommensurabel modulierten Kristallstrukturen (M2Te14I12)(TeI4) Te2I2) (M = Rh, Ir) existieren hingegen zweifach positiv geladene (M2Te14I12)2+-Cluster (M = Rh, Ir) neben nahezu planaren Schichten bestehend aus (TeI4)2--Gruppen und (Te2I2) Molekülen. Das (Te+I2I2) Molekül konnte anhand quantenchemischer Rechnungen als stabiles Molekül in der Gasphase bestätigt werden und stellt ein schweres Homologes des S2Cl2 dar.
Die quaternäre Verbindung (Ir2Te14Br12)2(InBr4)2 enthält ebenfalls einen zweifach positiv geladenen Cluster, {[Ir3+2(Te0)4(Te+0,5)4(Te-)2]Te2+2Br-6)2}2+, dessen Ladung durch zwei einfach negativ geladene (In3+Br4)--Gruppen ausgeglichen wird sowie einem neutralen Cluster, [Ir3+2(Te0)4(Te3.-)2](Te2+2Br-6)2, mit einem Te3.--Radikalanion, dessen Existenz mittels ESR-Spektroskopie nachgewiesen wurde.
Die aus diskreten Molekülen aufgebaute Verbindung [Ru2(Te6)]TeBr3)4(TeBr2)2 kann je nach Betrachtungsweise entweder als Te6-Ring, der durch zwei (Ru2+Te2+3Br-8)-Kappen umgeben ist oder als [Ru2Te6]4+-Heterokuban, welcher zusätzlich mit Bromidotelluratliganden koordiniert ist, beschrieben werden. In den Kristallstrukturen der ternären Koordinationspolymere [M(Te6)]X3 (M = Rh, Ir; X = Cl, Br, I) verlaufen entlang der c-Achse lineare, positiv geladene [M(Te6)]3+-Ketten (M = Rh,Ir), in denen abwechselnd ein ektronenreiches Übergangsmetallatom und sechsgliedrige Tellurringe koordinativ gebunden sind, wodurch eine hoch symmetrische Anordnung realisiert wird. Dabei zeigt sich aufgrund der starken Bindung an die Übergangsmetallatome eine erhebliche Ringspannung im Vergleich zu den bekannten sechsgliedrigen Tellureinheiten. Isolierte Halogenidionen, welche sich in der Ebene der Übergangsmetallatome befinden, dienen einerseits zum Ladungsausgleich der positiv geladenen Ketten und verbrücken andererseits innerhalb eines Stranges benachbarte Te6-Ringe.
Im Koordinationspolymer [Ru(Te8)]Cl2 konnte ein neutraler Te8-Ring mit einer bislang für achtgliedrige Chalkogenmoleküle unbekannten Konformation röntgenographisch nachgewiesen werden. Die Abweichung von der bevorzugten Kronenform, ist wiederum ein E ekt der starken Bindung zwischen den Telluratomen und den Rutheniumatomen. In den linearen, positiv geladenen [Ru(Te8)]2+-Strängen binden 3+3 Telluratome an zwei benachbarte Rutheniumatome. Isolierte Chlorid-Ionen, die zwischen den positiven Strängen eingelagert sind, dienen in der Kristallstruktur zum Ladungsausgleich.
Das quaternäre Koordinationspolymer [Ru(Te9)](InCl4)2 beinhaltet eine neuartige, zyklische Te9-Einheit, welche die Vielfalt der tellurreichen Ringstrukturen erweitert. Analog zum ternären Koordinationspolymer [Ru(Te8)]Cl2 gliedert sich die Kristallstruktur in [Ru(Te9)]2+-Stränge, die entlang der c-Achse verlaufen, und dem komplexen Anion (InCl4)-. Ein besonders interessantes Strukturmerkmal der positiv geladenen Stränge stellt das käfigartige Fragment [Ru-(Te9)-Ru] dar, dessen hexazyklischer Aufbau aus kondensierten Fünfringen den isolierten Undecapniktiden Pn113- (Pn = P, As, Sb) topologisch äquivalent ist. Für einen genaueren Einblick in die chemische Bindung der tellurreichen Koordinationspolymere [Rh(Te6)]Cl3, [Ru(Te8)]Cl2 und [Ru(Te9)](InCl4)2 wurden quantenchemische Rechnungen durchgeführt. Eine topologische Analyse der Elektronendichte und des Elektronenlokalisierbarkeitsindikators (ELI-D) an koordinierenden und freien Tellurmolekülen sollte zu detaillierten Aussagen über Gründe der extremen Ringspannung aufgrund der Koordination führen. Zusammenfassend kann feststellt werden, dass die Verzerrung der Tellurringe in den Koordinationspolymeren einerseits der gerichteten Bindung zu den Übergangsmetallatomen geschuldet ist und andererseits um Platz für die sich abstoßenden freien Elektronenpaare zu bekommen.
Für weitere Arbeiten könnten zunächst einerseits die Untersuchungen zur Löslichkeit der Clusterverbindung Re4Q4(TeCl2)4Cl8 (Q = S, Se, Te) in organischen Lösungsmitteln als Ausgangspunkt für die Austauschreaktionen der terminalen Halogenidotelluratliganden durch neue verbrückenden Gruppen von Interesse sein. Andererseits kann auch innerhalb des untersuchten Systems, durch Variation der Eduktzusammensetzung, neuartige Tellurmoleküle erwartet sowie die bereits erworbenen Erkenntnisse zur Übertragung auf das leichtere Homologon Selen genutzt werden.
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Weston, Steven John. "The optical spectroscopy of novel cadmium telluride/cadmium manganese telluride heterostructures". Thesis, University of Hull, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321049.
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Dolhen, Morgane. "Verres, vitrocéramique et céramique à base de TeO2 pour l'optique". Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0112/document.
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Du fait de leur grande qualité optique, les monocristaux sont largement utilisés dans le domaine de la photonique, pour l’émission laser de puissance, la conversion de fréquence,.... Les monocristaux sont toutefois limités par leur mode fabrication qui est lent et onéreux et par la difficulté d’obtenir des pièces de grandes dimensions. Les verres tellurites sont des candidats de choix en raison de leur réponse non-linéaire élevée, leur mise en forme aisée et leur faible coût de production. Toutefois, pour certaines applications nécessitant des effets non-linéaires de second ordre, les verres ne peuvent pas être utilisés en raison de leur isotropie optique. Au cours de cette thèse, nous avons donc entrepris l’élaboration de composites vitrocéramiques tellurites composés de cristaux non-centrosymétriques capables de générer un signal de seconde harmonique. Les composites sont élaborés par co-frittage SPS d’une poudre de verre et de cristaux. Nous nous sommes également intéressés à la réalisation de céramiques transparentes tellurites pour l’élaboration de cavités lasers de dimensions millimétriques. Les matériaux tellurites sont en effet des candidats intéressants en raison de leurs indices de réfractions linéaires élevées et leurs basses énergies de phonon qui favorisent les transitions radiatives. Les céramiques transparentes ont été obtenues par un procédé innovant de cristallisation complète et congruente du verre qui allie la facilité de mise en forme du verre et les propriétés de la céramique finale. Nous avons également mise en œuvre la réalisation d’une nouvelle céramique transparente tellurate (TeVI) par frittage SPS d’une poudre céramique broyée. Les composés tellurates ont l’avantage de présenter de basses énergies de phonons et des propriétés diélectriques micro-ondes intéressantesOwing to thier high optical quality, single-crystals are widely used in photonics, for high power laser, frequency conversion… However, single-crystals are constrained by their manufacturing process which is slow and expensive and because it difficult to obtain large parts. Tellurite glasses are ideal candidate due to their high nonlinear response, the easy glass shaping and their low manufacturing cost. Nonetheless, for some kind of applications requiring second order nonlinear effects, glasses can’t be used because of their optical isotropy. During this thesis, we undertook the elaboration of tellurite glass-ceramics composites consisting of noncentrosymmetric crystals able to generate second harmonic signal. Composites are elaborated by SPS co-sintering of a glass powder and crystals. We are also interested in the elaboration of transparent tellurite ceramics in order to make millimetric laser cavities. Indeed, tellurite-based materials are interesting candidates owing to their high nonlinear refractive index and their low phonon energy, which favors radiative transitions. Transparent ceramics have been fabricated by an innovative way, the full and congruent crystallization of glass which combines the easy glass shaping and the properties of the final ceramic. We have also developed the elaboration of a new transparent tellurate ceramic (TeVI) by SPS sintering of a crushed ceramic powder. Tellurate compounds have the advantage of showing low phonon energy and interesting microwave dielectric properties
13
Pathirana, Hema M. K. K. "Ligand chemistry of tellurium". Thesis, Aston University, 1985. http://publications.aston.ac.uk/14516/.
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Nielsen, Michele D. "Thermoelectric Exploration of Silver Antimony Telluride and Removal of Second Phase Silver Telluride". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282146316.
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Herzog, Uwe. "Beiträge zur Silicium-Chalcogen-Chemie einschließlich analoger Germanium-, Zinn- und Bleiverbindungen". Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-7367422.
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Hauptziel dieser Arbeit ist die Synthese und Charakterisierung neuer Organosilicium-Chalcogen-Verbindungen (Chalcogen: Schwefel, Selen, Tellur), sowohl mit acyclischen, als auch mono- und polycyclischen Strukturen. Dabei konnten in vielen Fällen auch isostrukturelle Verbindungen mit Germanium- oder Zinnatomen anstelle von Silicium aufgebaut werden. Insgesamt wurden 42 der dargestellten Verbindungen auch durch Röntgenkristallstrukturanalysen charakterisiert. In cyclischen und polycyclischen Verbindungen war es damit auch möglich, die auftretenden Konformationen der Ringe- bzw. Ringsysteme zu bestimmen und die Resultate mit den Ergebnissen von DFT-Berechnungen zu vergleichen. Die NMR-Spektroskopie war parallel zu Kristallstrukturanalysen und GC/MS Messungen die Methode der Wahl zur Charakterisierung der dargestellten Verbindungen. Dabei boten sich neben der 1H und 13C NMR auch die 29Si, 119Sn, 207Pb, 77Se, und 125Te NMR Spektroskopie an, da man direkt die Elemente analysiert, die die Ringsysteme aufbauen, was zu einer weit höheren Strukturempfindlichkeit führt. Vor allem beim Vergleich von 77Se und 125Te NMR Daten analoger Selen- und Tellurverbindungen ergaben sich lineare Korrelationen sowohl der chemischen Verschiebungen als auch der Kopplungskonstanten 1JSiE bzw. 1JSnE mit Faktoren von ca. 2.5. Ähnliche Korrelationen konnten auch zwischen 29Si und 119Sn bzw. 119Sn und 207Pb NMR chemischen Verschiebungen gezogen werden. Von einigen Verbindungen konnten durch 29Si MAS NMR Spektroskopie auch die Tensorhauptwerte der chemischen Verschiebung ermittelt werden. Parallel dazu wurden mittels GIAO und IGLO Verfahren die 29Si NMR chemischen Verschiebungen ausgehend von den aus den Kristallstrukturanalysen zugänglichen Geometrien berechnet. Neben cyclischen Verbindungen konnten unter Verwendung des sperrigen Hypersilylrestes auch eine Reihe acyclischer Verbindungen mit der Sequenz Si–E–Si bzw. Si–E–Sn dargestellt und z. T. auch strukturell charakterisiert werden.
16
Mukherjee, Goutam. "Characterization of epitaxial cadmium telluride and lead telluride layers grown by R.F. magnetron sputtering". Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5927.
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Sputter-deposited heteroepitaxial layers of (100) CdTe $\Vert$ (100) KBr prepared at growth temperatures of 300-325$\sp\circ$C are found to be p-type with high dark resistivities on the order of 2 $\times$ 10$\sp5$ ohm-cm. The epilayers are highly photoconducting. The photoconductivity $\sigma\sb{ph}$ (expressed as $\sigma\sb{ph} \propto f\sp{\gamma}$) is observed to exhibit a sublinear ($\gamma$ $\prec$ 1) dependence on illumination intensity f. Photo-Hall effect measurements show that the photoconductivity is due to change in carrier concentration and not due to any enhancement in the carrier mobility. Moreover, the photocurrent is carried by holes. Hall measurements on sputter-deposited epitaxial PbTe films have confirmed that samples prepared at high growth temperatures are n-type and those grown at low substrate temperatures are p-type, irrespective of the substrate bias applied during growth. The low temperature mobility values in the sputter-deposited samples are found to be limited by a temperature-independent neutral impurity scattering mechanism. One of the features of heteroepitaxial growth is the existence of a large density of structural defects at the interface due to lattice mismatch. (Abstract shortened by UMI.)
17
Toptchieva, Anna A. "Tellurite resistance of Proteus mirabilis". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0016/NQ49293.pdf.
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Awan, G. R. "Cadmium telluride for solar cells". Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6852/.
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Cadmium telluride is an attractive material for solar cell applications because of its near optimum bandgap and high absorption coefficient. This thesis presents the results of a study into the use of CdTe for solar cells. Three types of cell have been investigated, namely; CdS/CdTe devices fabricated by the vacuum evaporation of CdS onto either: (a) single crystal p-CdTe substrates or (b) p-CdTe thin films, and (c) p-Cu(_2)Te/n-CdTe devices made by a chemiplating process onto single crystal n-CdTe. The effects of substrate polishing and preparation on the performance of CdS/CdTe bulk crystal cells have been Investigated together with the problems of doping and contacting to p-type CdTe. These studies have shown that the best results are obtained with devices that have been prepared on pad polished, phosphorus doped substrates using carbon contacts (efficiency = 7.2%). The influence of deposition conditions on the electrical and structural properties of thin CdS and CdTe layers, and their effect on CdS/CdTe device efficiency were also studied, and optimum growth conditions established. In the third group of CU(_2)Te/CdTe solar cells a number of structural and electrical aspects such as the phase of Cu(_2)Te, and the Influence of dopants, substrate resistivity and preparation and ageing on cell efficiency have been examined. As secondary objectives, an investigation Into the epitaxial growth of CdS on CdTe, and the characterisation of as-grown and doped CdTe have been carried out. It has been shown that epitaxy is possible on the {111} and {221} faces of CdTe. The characterisation of CdTe has revealed the presence of dominant levels at energies above the valence band of 0.50 eV in the as-grown crystals; 0.53, 0.71 and 0.84 eV in Te-annealed single crystals; and 0.35 eV in Cu doped CdTe thin films.
19
West, Anthony A. "Structural studies in tellurium chemistry". Thesis, Aston University, 1989. http://publications.aston.ac.uk/9705/.
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The primary theme of this research was the characterisation of new and novel organo-tellurium complexes, using the technique of single crystal X-ray analysis to establish more firmly the various coordination modes of tellurium. In each study the unit cell dimensions and intensity data were collected using an Enraf-Nonius CAD-4, four circle diffractometer. The raw data collected in turn was transferred to the Birmingham University Honeywell Multics System and processed using the appropriate computer packages for the determination of crystal structures. The molecular and crystal structures of: bis[2-(2-pyridyl)phenyl]tritelluride, bis[2-(N-hydroxy)iminophenyl] ditelluride, 2-(2-pyridyl)phenyltellurium(IV) tribromide, (2-N,N-dimethylbenzylamine-C,N')tellurium(IV)tribromide, 2-dichloro(butyl)tellurobenzaldehyde, 2-dichlorobutotelluro-N-dimethylbenzyl ammonium chloride, dimethyldithiocarbamato[2-(2-pyridyl)phenyl]tellurium(II), dimethyldithiocarbamato[2-(2-quinolinyl)phenyl]tellurium(II) and para-ethoxypheny[2-(2-pyridyl)phenyl]telluride are described. In each structure, the Lewis acidity of tellurium appears to be satisfied by autocomplex formation, through short-range intramolecular secondary bonds between tellurium and an electron denoting species, (generally nitrogen in these structures) with long range weak inter molecular contacts forming in the majority of the tellurium(IV) structures. The order of Lewis acidity in each structure can be considered to be reflected by the length of the short range intramolecular secondary bond, identified, that is, when tellurium has a low Lewis acidity this interaction is long. Interestingly, no primary bonds are found trans to a Te-C covalent bond in any of the above structures, highlighting the strong trans effect of aromatic and aryl groups in tellurium complexes.
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Urbánková, Kristýna. "Multikomponentní extrakce a prekoncentrace mikrokoncentrací As, Sb, Se a Te na modifikovaný silikagel, stanovení na ICP-AES (ICP-MS) a aplikace na vzorky vod". Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-233280.
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The determination of inorganic speciations of arsenic, antimony, selenium and tellurium in natural waters demands often separation and preconcentration. Solid phase extraction is a very effective method for these purposes. In this paper the separation and preconcentration of these microelements is realised on the basis of modified silica Separon SGX C18, SGX C8, SGX CN, SGX NH2, SGX Phenyl and strongly basic anion Exchanger SGX AX. The sorption was provided in the presence of cationic surfactants such as benzyldimethyl dodecylammonium bromide (Ajatin), benzyldimethyltetradecylammonium chloride (Zephyramine), 1-ethoxycarbonylpentadecyltrimetrhylammonium bromide (Septonex) and selected complexing agents 4-(2-pyridylazo)resorcinol (PAR), 8-hydroxyquinoline-5-sulphonic acide (8-HQS), 1,2-dihydroxybenzene (PYR), amonium 1-pyrrolidinecarbodithioate (APDC), sodium diethyldithiocarbamate (DTC) or thiourea(Thur). The interactions of the formed ion associate with the sorbent shows a complicated character which has not been cleared as yet. The previous conditioning of the sorbent plays an outstanding role. Thus, the sorption efficiency was studied in the presence and absence of surfactant and of selected organic complexing agents. Moreover, the influence of pH of the sorbed solution as well as the speed and the volume of the solution running through the sorbent and the type and volume of the eluent on the resulting sorption efficiency was evaluated. The sorption was successfully carried out from 50-1000 ml of solution which allows the 100 fold increase of the preconcentration factor and the determination of the microelements in g.l-1 instead of mg.l-1 by using the common ICP-AES. The influence of macroelements occurring in waters as well as B, Be, Bi, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Sr, Ti, V and Zn in comparable concentrations involve less than 5% error. After the quantitative elution of microelements, the organic solvents were evaporated under IR lamps prior to the determination by ICP-AES and |ICP-MS. The conditions for the direct determination of arsenic, antimony, selenium and tellurium in g.l-1 with ICP-MS were also described in detail in the absence and presence of internal standards Ge and Bi. However, even in this case the preconcentration on silica in the presence of surfactant and selected organic complexants was also tested. When the sorption was followed from 500 ml a 50 fold enrichment factor is reached and the sensitivity for the microelements is improved. The direct determination and the sorption of microelements were applied on synthetic and real waters (dirinking, surface, mineral and sea waters). Instrumental and practical detection limits for various water samples were evaluated according to IUPAC. The results from 1000 ml solution of real waters after sorption on modified silica and the final determination of microelements with ICP-AES were compared with those from ICP-MS without sorption using the method of standards addition in the presence of suitable internal standards. By comparison of results for synthetic and real water samples the error of the determination of microelements was evaluated.
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Ergunt, Hasan Yasin. "Bulk Growth And Characterization Of Cadmium Zinc Telluride Crystals For Mercury Cadmium Telluride Infrared Detector Applications". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614738/index.pdf.
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HgCdTe (MCT) infrared (IR) photodetectors have been used for various military and civilian applications including thermal imaging, medical imaging, and astronomy. These detectors are commonly fabricated on MCT layers grown on a foreign substrate epitaxially using delicate growth techniques such as Molecular Beam Epitaxy (MBE). The crystal quality of epitaxial layers grown on a substrate critically depends on the quality of the substrate. One of the stringent requirements in choosing the substrate material is the lattice match between grown layer and the underlying substrate. With perfectly matching lattice structure, CdZnTe has been the major substrate material for the MCT growth. The production of defect free single crystal CdZnTe bulk crystal has then attracted great attention among the research and industrial community of MCT based photodetectors. This thesis focuses on the growth and characterization of Cd1-xZnxTe crystals with the main objective of obtaining high-quality, CZT bulk crystal with large crystal sizes. To be compatible with the subsequent MCT growth, we aimed to obtain Cd0.96Zn0.04Te crystals with (211) crystal surface orientation. CdZnTe bulk crystal growths were performed in three-zone vertical Bridgman furnace by a high temperature melt process called &ldquoModified Bridgman Technique&rdquo
. Difficulties in both growth and characterization are presented and discussed in this report. Characterization of the grown CdZnTe crystal was performed to determine the crystallographic orientation, crystal quality, Zn distribution, IR transmission, resistivity, polarity, etch pit density, and surface properties. For this purpose, electron microscopy with analytical diagnostic tools like EDS and EBSD, XRD, optical transmission spectroscopy, and electrical measurement systems have been employed. We demonstrated the successful growth of single crystal CZT crystals using our simple Bridgman furnace. Physical properties of the grown crystal were very promising and encouraging for future applications. Crystal pieces having sizes larger than 5 x 5 mm2 with uniform Zn distribution and (211) surface orientation were obtained. IR transmission of nearly 60% which is as good as that of the commercial substrates was achieved. The electrical resistivity was much better (higher) than generally accepted values. However, the XRD results indicated the presence of defects and/or micro grains in the bulk crystal. These structures seemed to have prevented obtaining good FWHM values, which are the measure of crystal quality, in the XRD analysis.
22
Jaworski, Christopher M. "An Investigation Into Lead Telluride Lead Sulfide Composites And Bismuth Tin Telluride Alloys For Thermoelectric Applications". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228340969.
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Romo, Luis C. "Zinc telluride deposition using close space sublimation to create back contacts for cadmium telluride solar cells". To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
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Harris, Fred Raymel. "Fundamental investigations of bismuth telluride-titanium telluride layered nanostructured materials synthesized by modulated multilayer elemental reactants /". view abstract or download file of text, 2004. http://wwwlib.umi.com/cr/uoregon/fullcit?p3153789.
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Thesis (Ph. D.)--University of Oregon, 2004.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 171-176). Also available for download via the World Wide Web; free to University of Oregon users.
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Swan, R. "Experimental studies of thin tellurium films". Thesis, London South Bank University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618631.
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Bauer, Cletus P. "Electron irradiation n type cadmium telluride". Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/21306.
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Archer, Neil Andrew. "Mercury diffusion in cadmium mercury telluride". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262522.
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Swan, Ronnie. "Experimental studies of thin tellurium films". Thesis, London South Bank University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316966.
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Nolting, Westly. "Electronic Transport in Thermoelectric Bismuth Telluride". ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1539.
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An experimental investigation of the electronic transport properties of bismuth telluride nanocomposite materials is presented. The primary transport measurements are electrical conductivity, Seebeck coefficient and Hall effect. An experimental apparatus for measuring Hall effect and electrical conductivity was designed, constructed and tested. Seebeck coefficient measurements were performed on a commercial instrument. The Hall effect and Seebeck coefficient measurements are two of the most important tools for characterizing thermoelectric materials and are widely used in the semiconductor industry for determining carrier types, carrier concentration and mobility. Further, these transport parameters are used to determine the thermal to electrical conversion efficiency of a thermoelectric material. The Boltzmann transport equation was used to analyze the Seebeck coefficient, carrier mobility and electrical conductivity as a function of carrier concentration for eleven samples. The relationship between the electronic transport and material/composite composition is discussed.
30
Sakida, Shinichi. "STUDIES ON STRUCTURE OF TELLURITE GLASSES". Kyoto University, 1999. http://hdl.handle.net/2433/181823.
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Jain, Swati. "Photoluminescence study of cadmium zinc telluride". Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1876.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains x, 84 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-83).
32
Marschall, Thomas [Verfasser]. "Tellur- und Tellur-Halogen-Polykationen sowie ein neues Tellursubhalogenid / Thomas Marschall". Gießen : Universitätsbibliothek, 2020. http://d-nb.info/1219982806/34.
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Liu, Jianfei. "Selective Deposition of Metallic and Semiconductor Materials onto DNA Templates for Nanofabrication". BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3143.
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This work examines the selective deposition of metallic and semiconductor materials onto DNA templates for the fabrication of nanodevices. DNA origami provides a simple and robust method for folding DNA into a variety of shapes and patterns and makes it possible to create the complex templates needed for nanodevices, such as nanoelectronic circuits, plasmonics, and nanosensors. Metallization of DNA origami templates is essential for the fabrication of such nanodevices. In addition, selective deposition of semiconductor materials onto the DNA template is of importance for making many nanodevices such as nanocircuits. Metallization of DNA origami presents several challenges beyond those associated with the metallization of other DNA templates such as λ-DNA. All of these challenges were addressed in this study. DNA origami templates were seeded with Ag and then plated with Au via electroless deposition. Selective continuous metal deposition was achieved, with an average metallized height as small as 32 nm. The structure of T-shaped DNA origami was also retained after metallization. Following the metallization of complete origami, site-specific metallization of branched DNA origami was also demonstrated. To achieve this, staple strands at select locations on origami were replaced with staple strands modified with binding sites at the end. These binding sites then attached to thiolated DNA coated Au nanoparticles through base pairing. The continuous Au nanowires formed at designated sites on DNA origami after Au plating had an average width of 33 nm, with the smallest ones ~20 nm wide. The continuity of nanowires was verified by conductivity tests- the only tests of this nature of which I am aware. Moreover, predesigned sites on "circuit-shaped" DNA origami were successfully metallized. The selective deposition of a variety of materials onto DNA templates for the formation of continuous DNA-templated nanowires was also demonstrated. Specifically, an electroless Ni plating solution was developed to enable the fabrication of uniform and continuous DNA-templated Ni nanowires. Tests showed that these DNA-templated Ni nanowires were conductive. Moreover, continuous DNA-templated Bi2Te3 and/or Te nanowires have been fabricated through galvanic displacement of DNA-templated Ni and Cu nanowires. Altogether, these results represent important progress toward the realization of DNA-templated nanofabrication.
34
Krebber, Wolfgang. "Neue Untersuchungen zur Chemie von Bis(pentafluorethyl)tellur und Bis(trifluormethyl)tellur". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967578736.
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Hesse, Malte [Verfasser]. "Zur Chemie der ersten wohl definierten Tellurin- und Stibonsäure / Malte Hesse". Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1023621533/34.
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Chau, Hei. "Synthesis and properties of tellurium-containing long chain fatty acid derivatives /". [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13554566.
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Spallacci, Claudia. "Cadmium Telluride Magic-Sized Clusters and Superstructures". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21669/.
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The aim of the present work is to gain new insights into the formation mechanism of CdTe magic-sized clusters (MSCs) at low temperatures, as well as on their evolution towards 1D and 2D nanostructures and assemblies thereof, under mild reaction conditions. The reaction system included toluene as solvent, octylamine as primary alkylamine, trioctylphosphine-Te as chalcogenide precursor and Cd(oleate)2 as metal precursor. UV-Vis absorption spectroscopy and transmission electron microscopy (TEM) were used to analyze samples containing concentrations of octylamine of 0.2, 0.8 and 2 M: well-defined, sharp absorption peaks were observed, with peaks maxima at 449, 417 and 373 nm respectively, and 1D structures with a string-like appearance were displayed in the TEM images. Investigating peaks growth, step-wise peaks shift to lower energies and reverse, step-wise peak shift to higher energies allowed to propose a model to describe the system, based on interconnected [CdTe]x cluster units originating an amine-capped, 1-dimensional, polymer-like structure, in which different degrees of electronic coupling between the clusters are held responsible for the different absorption transitions. The many parameters involved in the synthesis procedure were then investigated, starting from the Cd:Te ratio, the role of the amine, the use of different phosphine-Te and Cd precursors. The results allowed to gain important information of the reaction mechanism, as well as on the different behavior of the species featuring the sharp absorption peaks in each case. Using Cd(acetate)2 as metal precursor, 2D structures were found to evolve from the MSCs solutions over time, and their tendency to self-assemble was then analyzed employing two amines of different alkyl chain length, octylamine (C-8) and oleylamine (C-18). Their co-presence led to the formation of free-floating triangular nanosheets, which tend to readily aggregate if only octylamine is present in solution.
38
Lyster, Martin. "Electron microscope studies of cadmium mercury telluride". Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238271.
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Bates, C. M. "Pentamethylcyclopentadienyl (Cp*) compounds of selenium and tellurium". Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636056.
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Successful preparations were: (1) bis(pentamethylcyclopentadienyl)selenium, prepared by the reaction of selenium diethydithiocarbamate with lithiated pentamethylcyclopentadiene; (2) Cp*SenLi (n = 2,3,4), prepared by the reaction of elemental selenium with lithiated pentamethylcyclopentadiene in THF and its subsequent reaction with iodomethane to produce (3) methyl(pentamethylcyclopentadienyl)selenium or water to produce the polyselenide mixture (4) Cp*2Sen (n = 2,3,4). (4) was also produced by the low temperature reaction of selenium chloride with lithiated pentamethylcyclopentadiene. The compounds were characterised by conventional methods including 77Se NMR spectroscopy. The x-ray structural determination was obtained for compound (1) revealing the largest C-Se-C bond angle recorded for a simple diorganoselenide. The reactivities of the compounds (1) (3) and (4) were investigated in reactions with unsaturated transition metal fragments. In the reactions of (1) with sources of the tungsten and chromium carbonyl compounds [W(CO)5THF], [W(CO)3(CH3CN)3], [Cr(CO)5THF], [Cr(CO)4nbd] and [Cr(CO)3(CH3CN)3] the first example of reduction of a selenide to form a diselenide within the transition metal coordination sphere was observed. These produced the complexes [M(CO)2{Se2Cp*2}] (M = W, Cr). The x-ray structure determinations are included. These complexes contain the longest Se-C bonds recorded. A 1,2 metal shift was observed for the tungsten complex using the technique of two dimensional exchange NMR spectroscopy. (3) reacts with [W(CO5THF] or [Cr(CO)5THF] to produce the complexes [W(CO)5{Se(Me)Cp*}] and [Cr(CO)5{Se(Me)Cp*}]. The first recorded Se-W satellites are reported for the former. The compounds (1), (3) and (4) were reacted with diiron nonacarbonyl to produce the complex [Fe3Se2(CO)5]. Compound (1) was reacted with a half molar equivalent of [PdCl2(PhCN)2] to produce the complex [Pd2Cl4(SeCp*2)].
40
Hill, Susannah Margaret. "Analysis of tellurite resistance in aquatic bacteria". Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329467.
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Lopez, G. C. "Far-infrared detection with mercury cadmium telluride". Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370484.
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Conibeer, Gavin John. "Zinc diffusion in tellurium doped gallium antimonide". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262103.
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Weng, Luqian. "Sol-gel processing of tellurite thin films". Thesis, University of Lincoln, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312891.
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Misra, Shantanu. "Towards highly-efficient telluride-based thermoelectric materials". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0072.
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La recherche visant à remplacer les alliages toxiques de tellurure de plomb (PbTe) pour des applications thermoélectriques en génération d'électricité a conduit à des études intensives sur d'autres semi-conducteurs de chalcogènes à base de tellure. Dans ce contexte, le binaire SnTe est réapparu ces dernières années comme un candidat prometteur en raison de sa structure cristalline cubique et de sa structure de bandes de valence électroniques similaire à celle de PbTe. L'indium est un dopant particulièrement intéressant pour SnTe car il entraîne l'apparition d'un niveau résonant et d’un état supraconducteur. Autre semi-conducteur remarquable, InTe a récemment montré qu'il possédait des propriétés thermoélectriques prometteuses en raison de sa très faible conductivité thermique de réseau. L'absence d'études détaillées de ses propriétés de transport fait de ce composé un domaine de recherche prometteur en thermoélectricité. Dans ce travail, nous présentons une étude expérimentale et théorique détaillée des propriétés de transport de ces deux composés à base de Te (XTe ; X = Sn, In) dans une large gamme de températures (2 - 800 K). Dans une première partie, l'influence de l'indium sur les propriétés de transport du composé Sn1.03-xInxTe (0 ≤ x ≤ 40 %) est examinée. Les résultats expérimentaux sont étayés par des calculs de structures de bandes électroniques effectués selon la méthode Korringa-Kohn-Rostoker avec l'approximation du potentiel cohérent (KKR-CPA). Les résultats tant expérimentaux que théoriques démontrent la nature résonante de In dans Sn1.03Te avec un niveau de dopage optimal de 2 % correspondant à un pouvoir thermoélectrique optimum. Les mesures des propriétés de transport à basse température mettent également en évidence l'évolution complexe des propriétés de transport pour de faibles teneurs en In. Nos travaux sur InTe ont été effectués sur des échantillons aussi bien monocristallins que polycristallins. La synthèse d’un grand monocristal de InTe par la méthode Bridgman. La possibilité de contrôler la concentration de défauts de ce matériau a été envisagée grâce à des recuits de saturation, effectuées aussi bien du côté riche en In que du côté riche en Te. Comparable au ZT maximal de ~ 0,7 atteint à 780 K dans l’échantillon monocristallin selon les plans ab, un ZT maximum de ~ 0,9 à 710 K a été obtenu dans un échantillon polycristallinThe search to replace the toxic lead telluride (PbTe) alloys for thermoelectric applications in power generation has led to intensive studies of other telluride-based chalcogenide semiconductors. In this context, the binary SnTe has re-emerged over the last years as a promising candidate due to its rock-salt structure and electronic valence band structure similar to PbTe. Indium is a particularly intriguing dopant for SnTe as it leads to the appearance of a resonant level and superconductivity. Another noteworthy chalcogenide semiconductor, InTe has been recently shown to harbor promising thermoelectric properties due to its remarkably very low lattice thermal conductivity. The lack of detailed studies of its transport properties makes this compound a promising area of research in the field of thermoelectrics. In this work, we report on a detailed experimental and theoretical investigations of the transport properties of these two Te-based chalcogenides (XTe; X = Sn, In) in a wide range of temperatures (2 – 800 K). In a first part, the influence of indium on the transport properties of Sn1.03-xInxTe (0 ≤ x ≤ 40 %) is considered. The experimental results are supported by electronic band structure calculations performed using the Korringa-Kohn-Rostoker method with the coherent potential approximation (KKR-CPA). Both experimental and theoretical results demonstrate the resonant nature of In in Sn1.03Te with an optimum doping level of 2% giving the highest thermopower value for this system. Low-temperature transport properties measurements further highlight the complex evolution of the transport properties for low In contents. Investigations performed on InTe were performed on both single-crystalline and polycrystalline samples. A large single crystal of InTe was grown by the vertical Bridgman method. The possibility to control the defect concentration in InTe was considered though the saturation annealing method, carried out on the In-rich and Te-rich side of the solidus. Comparable to the peak ZT of ~ 0.7 at 780 K achieved in single-crystalline InTe within the ab plane, a maximum ZT of ~ 0.9 at 710 K was obtained in polycrystalline InTe
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Abid, K. Y. "Synthetic approaches to organoselenium and tellurium semiconductors". Thesis, Aston University, 1987. http://publications.aston.ac.uk/9723/.
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Ahmed, Mohammed A. K. "Synthesis and physical investigation of tellurium dithiocarbamates". Thesis, Aston University, 1985. http://publications.aston.ac.uk/11726/.
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Bahrou, Andrew S. "Polonium volatilization by tellurite resistant marine microorganisms". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 85 p, 2009. http://proquest.umi.com/pqdweb?did=1885462311&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Sivaraman, Gowri. "Characterization Of Cadmium Zinc Telluride Solar Cells". [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000219.
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Abbott, Jonathan D. "Carbon Coated Tellurium for Optical Data Storage". BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2360.
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A highly durable optical disk has been developed for data archiving. This optical disk uses tellurium as the write layer and carbon as a dielectric and oxidation prevention layer. The sandwich style CTeC film was deposited on polycarbonate and silicon substrates by plasma sputtering. These films were then characterized with SEM, TEM, EELS, ellipsometry, ToF-SIMS, etc, and were tested for writability and longevity. Results show the films were uniform in physical structure, are stable, and able to form permanent pits. Data was written to a disk and successfully read back in a commercial DVD drive.
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Szwak, Małgorzata. "Halogen- und Pseudohalogen-Verbindungen des Tellurs". kostenfrei, 2006. http://www.diss.fu-berlin.de/2007/82/index.html.
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