Готові списки джерел за темами / Mixed Lanthanides

Добірка наукової літератури з теми "Mixed Lanthanides"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Mixed Lanthanides"

Martinez-Martin, Paloma, Josefina Perles, and Juan Carlos Rodriguez-Ubis. "Crystal Structure Dependence of the Energy Transfer from Tb(III) to Yb(III) in Metal–Organic Frameworks Based in Bispyrazolylpyridines." Crystals 10, no. 2 (January 27, 2020): 69. http://dx.doi.org/10.3390/cryst10020069.

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Luminescent mixed lanthanide metal−organic framwork (MOF) materials have been prepared from two polyheterocyclic diacid ligands, 2,6-bis(3-carboxy-1-pyrazolyl)pyridine and 2,6-bis(4-carboxy-1-pyrazolyl)pyridine. The crystal structures of the two organic molecules are presented together with the structures for the MOFs obtained by hydrothermal synthesis either with Yb(III) or mixed Tb(III)/Yb(III) ions. Different coordination architectures result from each ligand, revealing also important differences between the lanthanides. The mixed lanthanide metal−organic frameworks also present diverse luminescent behavior; in the case of 2,6-bis(4-carboxy-1-pyrazolyl)pyridine, where no coordinated water is present in the metal environment, Tb(III) and Yb(III) characteristic emission is observed by excitation of the bispyrazolylpyridine chromophore.

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Sitran, Sergio, Dolores Fregona, and Giuseppina Faraglia. "Mixed Acetato-Dehydroacetato Complexes of Lanthanides." Journal of Coordination Chemistry 24, no. 2 (August 1991): 127–35. http://dx.doi.org/10.1080/00958979109409455.

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Chan, Eric J., Jack M. Harrowfield, Brian W. Skelton, and Allan H. White. "X-Ray Structural Studies of Small-Bite Ligands on Large Cations – Lanthanide(III) Ions and Dimethylphosphate." Australian Journal of Chemistry 73, no. 6 (2020): 539. http://dx.doi.org/10.1071/ch19506.

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Reactions of lanthanide chlorides or trifluoracetates (tfa) or picrates with trimethylphosphate alone in the first two cases or trimethylphosphate plus 1,10-phenanthroline or 2,2′;6′,2′′-terpyridine in the third, result in the formation of crystalline products containing dimethylphosphate (dmp–). Single crystal X-ray structural characterisation of these materials has shown that the stoichiometrically simple Ln(dmp)3 species obtained with chloride reactants and the lighter lanthanides are polymeric and commonly dimorphic, while the stoichiometrically more variable mixed dmp/tfa complexes have structures closely related to one phase of the Ln(dmp)3 family, and the presence of picrate and aza-aromatic ligands enables the isolation of Y and Lu derivatives containing binuclear species. In all, the dmp– ligands adopt exclusively the κ1O;κ1O′ bridging mode, the overall results indicating that this should apply to the complete lanthanide series.

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Beaudoux, Xavier, Matthieu Virot, Tony Chave, Gilles Leturcq, Nicolas Clavier, Nicolas Dacheux, and Sergey I. Nikitenko. "Catalytic dissolution of ceria–lanthanide mixed oxides provides environmentally friendly partitioning of lanthanides and platinum." Hydrometallurgy 151 (January 2015): 107–15. http://dx.doi.org/10.1016/j.hydromet.2014.11.011.

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Potts, Shannon Kimberly, Philip Kegler, Giuseppe Modolo, Simon Hammerich, Irmgard Niemeyer, Dirk Bosbach, and Stefan Neumeier. "Structural incorporation of lanthanides (La, Eu, and Lu) into U3O8 as a function of the ionic radius." MRS Advances 7, no. 7-8 (February 9, 2022): 128–33. http://dx.doi.org/10.1557/s43580-022-00226-1.

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AbstractThe International Atomic Energy Agency implements safeguard measures to verify the compliance of Member States to their international legal obligations using nuclear material and technology only for peaceful purposes. These safeguard measures, i.a., include analytical measurements of individual micrometer- and submicrometer particles taken by the IAEA on swipe samples during safeguard inspections at nuclear facilities. To ensure the quality control of the analytical results from particle analysis and to further develop mass spectrometric analysis methods, microparticles with well-defined properties as microparticulate reference materials are required. Therefore, mixed lanthanide/uranium oxide microparticles were produced as a first step towards composite reference materials with small amounts of fission products, Pu or Th. A deep understanding of the incorporation mechanisms of dopants into U3O8 structure is essential in this regard. Therefore, bulk-scale comparison materials were produced and doped with lanthanides by co-precipitation methods and systematically investigated by TG, XRD, and Raman. These results will be integrated into the particle production process to design well-defined microparticulate mixed-oxide reference materials. Graphical abstract

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Sulcová, P., L. Vitásková, and M. Trojan. "Study of Ce0.9Tb0.05Ln0.05O1.975 compounds as ceramic pigments." Journal of Mining and Metallurgy, Section B: Metallurgy 44, no. 1 (2008): 83–89. http://dx.doi.org/10.2298/jmmb0801083s.

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New inorganic pigments based on CeO2 were synthesized as high-temperature Environment friendly inorganic pigments. This work is focused on mixed oxides based on ceria which are doped by rare earth elements, i.e. compounds with formula Ce0.9Tb0.05Ln0.05O1.975, where Ln means lanthanides. The pigments were prepared by the solid state reaction. Their colour properties were investigated depending on content of selected lanthanides and calcination temperature. All prepared pigments were applied into organic matrix and ceramic glaze. The pigments were evaluated from the standpoint of their structure, colour properties and particle sizes.

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Khan, Azad A., Arun K. Saxena, and K. Iftikhar. "Mixed-ligand lanthanide complexes—X. Interaction of trivalent lanthanides with 1,10-phenanthroline and thiocyanate in alcohol." Polyhedron 16, no. 23 (September 1997): 4143–51. http://dx.doi.org/10.1016/s0277-5387(97)00139-3.

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Bhattacharyya, Arunasis, and Prasanta K. Mohapatra. "Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review." Radiochimica Acta 107, no. 9-11 (September 25, 2019): 931–49. http://dx.doi.org/10.1515/ract-2018-3064.

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Abstract Separation of trivalent actinide (An) and lanthanide (Ln) elements is one of the burning topics in the back end of the nuclear fuel cycle due to the similarity in their chemical behaviour. A significant amount of research is being carried out worldwide to develop suitable ligands for the separation of the trivalent actinides and lanthanides. Some of the research groups are engaged in continuous improvement of the di-ethylene-triamine-penta acetic acid (DTPA) based Ln/An separation method, whereas extensive research is going on for the development of the lipophilic and hydrophilic ‘N’ donor heteropolycyclic ligands as the actinide selective ligand. A number of ‘S’ donor ligands are also explored for the Ln/An separation. In the present review, we made an attempt to highlight various separation processes based on soft donor ligands developed for Ln/An separations. Beside the conventional solvent extraction processes, separation possibilities membrane based and solid phase extraction techniques are evaluated for the Ln/An separation and are compiled in the present review.

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Liu, Jing, Elena Quinteiro González, Anna M. Kaczmarek, and Rik Van Deun. "Dual-mode upconversion and downshifting white-light emitting Ln3+:Gd2W2O9 materials." New Journal of Chemistry 42, no. 4 (2018): 2393–400. http://dx.doi.org/10.1039/c7nj04337f.

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Both approaches (mixing two samples and co-doping with all the lanthanides) yielded materials which showed nearly identical downshifting white-light emission, while significantly different upconversion luminescence was obtained for the mixed powders and the co-doped synthesized materials.

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Sliusarchuk, Lyudmila, Lidia Zheleznova, and Artem Mishchenko. "MIXED-LIGAND ACETYLACETONATE COMPLEXES OF LANTANUM (III) AND GADOLINIUM (III) WITH CARBOXYLIC ACIDS AND ACETONITRILE OR DIMETHYLFORMAMIDE." Ukrainian Chemistry Journal 85, no. 1 (April 4, 2019): 3–12. http://dx.doi.org/10.33609/0041-6045.85.1.2019.3-12.

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This paper presents the study of mixed-ligand complexes of Ln(III), which are used as volatile precursors in CVD processes for the preparation of lanthanide-containing films and coatings. New mixed-ligand acetylacetonate complexes of lanthanides (III) with acetic (propionic) acid and acetonitrile or dimethylformamide were synthesized and investigated by physic-chemical methods of analysis (elemental analysis, differential thermal analysis, IR spectroscopy, powder X-ray diffraction). Using mixed-ligand complexation, the properties of the initial lanthanide β-diketonates (in particular, chemical and thermal stability) can be changed significantly. To assess the stability of the synthesized mixed-ligand complexes, their quantum-chemical modeling was performed using the semi-empirical method Sparkle/PM7. Standard changes of the Gibbs energy ∆G0298 were calculated for the solution reaction of (1) synthesis of mixed-ligand complexes and (2) substitution of one of the β-diketonate ligands in the Ln(III) tris-acetylacetonates dihydrates by an acetate ion or propionate ion. The ∆G0298 values for the syntesis reaction mainly increases with increasing donor basicity and decreasing ionic radii Ln(III) in the La>Gd>Lu series. For all mixed ligand complexes of Ln(III), the heats of formation are negative, which indicates their thermodynamic stability in solution. It was established that the obtained complexes have the same composition of the general formula [Ln(AA)2·L·2D], where Ln (III) = La, Gd; НАА- acetylacetonе; L - anion of acetic (HAc) or propionic (HРrop) acids, D- acetonitrile (AN), dimethylformamide (DMFA). The results of the thermal analysis confirm the computational data: in the case of the lanthanum mixed-ligand complexes, the carboxylic acid is coordinated to the central ion through bridging carboxylate-ions, which contributes to the formation of oligomers. The lanthanum mixed-ligand complexes are not volatile due to their oligomeric structure. On the other hand, similar gadolinium complexes are monomeric and sublimate at 180 - 350 °C.

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Дисертації з теми "Mixed Lanthanides"

Moreno, Pineda Eufemio. "New f-block and mixed d,f-block molecular nanomagnets." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/new-fblock-and-mixed-dfblock-molecular-nanomagnets(2f53085a-081b-4b27-a866-28f37f1fd633).html.

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Molecular Nanomagnets have been proposed as plausible candidates in a variety of futuristic applications. Thorough understanding of the magnetic properties of these systems is therefore necessary to develop devices that include such units. The aim of this thesis is to synthesise and structurally and magnetically characterise a range of systems that could be used as elementary units in three proposed applications such as: data storage devices, magnetic refrigerants and qubits for quantum computing. A series of mixed 3d/4f metal complexes were synthesised through solvothermal reactions and characterised by X-ray single crystal diffraction and SQUID magnetometry. Through indirect methods it was possible to obtain high magnetic entropy change for some systems. It was also possible to obtain some insight into the magnetic interactions within the systems through modelling the magnetic data. The role of the 4f-4f and 3d-4f interactions in two sets of molecules is also described. The first study is in an asymmetric dysprosium dimer, where through a range of experimental techniques and advanced theoretical methods, such ab-initio calculations we are able to explain the role of the intramolecular interactions and their effect on the SMM properties of this system. Similarly, insight into the role of the 3d-4f interactions is achieved through the observation of the magnetic behaviour of a family of 27 tetranuclear systems, though SQUID data and ab-initio calculations. Finally, chemical functionalization of a well-proposed qubits, namely {Cr7Ni} and subsequent reaction with a redox active metal ion, CoII/III, two {Cr7Ni} systems are linked. The magnitude of the exchange interaction between the {Cr7Ni}-CoII-{Cr7Ni} was determined through Electron Paramagnetic Resonance. Furthermore, by chemical oxidation/reduction of the cobalt between paramagnetic and diamagneticstates, i.e. CoII and CoIII respectively, we demonstrate that the interaction can be switched ON/OFF. This characteristic makes of these systems candidates to function as a SWAP gate.

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Diallo, Mamoudou. "Matériaux moléculaires à base de lanthanides et de métaux de transition : de la synthèse à l’architecture cristalline." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0010.

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Il est désormais possible, en utilisant la méthode de synthèse par diffusion lente en milieu gel, d’élaborer de nouveaux matériaux moléculaires mixtes 4f-3d tridimensionnels présentant des propriétés physiques et chimiques très intéressantes. La méthode gel est une technique de synthèse simple, économique, écologique et respectueux de l’environnement qui jusque-là n’avait généralement été utilisée que pour la mise au point de matériaux moléculaires mononucléaires. Au cours de cette thèse doctorale en cotutelle entre l’Université Assane Seck de Ziguinchor (Sénégal) et l’Université de Lorraine (France), il a été possible de mettre en évidence plusieurs nouvelles phases cristallines inédites de matériaux moléculaires. Dix nouveaux matériaux moléculaires mixtes 4f-3d ont été synthétisés par voie gel et structuralement caractérisés par diffraction des rayons-X sur monocristal. Huit d’entre eux appartiennent à une même famille de composés isostructuraux [Ln(III)M(II)(3,5-pdc)2(Oxa)0.5(H2O)8]2H2O (Ln = Pr, Nd, Sm, Eu et Gd; et M = Cu et Co) pouvant être décrits comme des polymères de coordination unidimensionnels constitués de chaînes «illimitées» en forme d’échelle. Les deux derniers, quant à eux, sont des polymères de coordination tridimensionnels. Le composé à base du Sm3+ et du Cu2+ [SmCu(3,5-pdc)2(Oxa)0.5(H2O)6]2H2O est un polymorphe à un des composés de la famille isostructurale. Il est constitué de couches parallèles pontées par les ligands oxalates pour engendrer la structure tridimensionnelle finale. Quant au composé à base du Dy3+ et du Ni2+ [DyNi0.5(3,5-pdc)0.5(Oxa)1.5(H2O)3,5]6,5H2O, il s’agit d’un polymère de coordination à charpente ouverte (MOFs). Il est formé de couches en forme de nid d’abeilles construites avec trois types de ligand oxalate interconnectées par le ligand de base pyridine-3,5-dicarboxylate pour donner une structure tridimensionnelle poreuse
New tridimensional 4f-3d molecular materials can be obtained through crystal growth in gel medium. A simple, economic, ecologic and environmentally friendly synthesis method that has been used until recently for the growth of mononuclear crystalline molecular materials. During this international joint PhD between Assane Seck Ziguinchor University (Senegal) and Lorraine University (France), it was possible to synthesize several novel crystalline phases of molecular materials. Ten new 4f-3d heteronuclear molecular materials was obtained by slow diffusion in gel medium and structurally characterized by single crystal X-ray diffraction. Eight of them belong to the same family of isostructural compounds [Ln(III)M(II)(3,5-pdc)2(Oxa)0.5(H2O)8]2H2O (Ln = Pr, Nd, Sm, Eu, Gd and M = Cu, Co) and can be described as one-dimensional coordination polymers. Their structure is composed of dinuclear chains sandwiching oxalate ligands and the three-dimensional network is ensured by hydrogen bonds of water molecules assisted by π-π* stacking interactions. The last two are three-dimensional coordination polymers. The one based on Sm3+ and Cu2+ [SmCu(3,5-pdc)2(Oxa)0.5(H2O)6]2H2O is a polymorph to a compound belonging to the family of isostructural compounds. Its structure consists of parallel layers bridged by oxalate ligands to generate a final three-dimensional network. As for the compound based on Dy3+ and Ni2+ [DyNi0.5(3,5-pdc)0.5(Oxa)1.5(H2O)3,5]6,5H2O it is a Metal-Organic Framework (MOFs). Its structure is formed of honeycomb layers constructed with three types of oxalate ligand interconnected by the core ligand pyridine-3,5-dicarboxylate to give rise to a porous three-dimensional structure

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Métin, Jacques. "Etude structurale de fluorures ternaires de lanthanides et mecanismes de transfert d'energie gd**(3+) -> eu**(2+) dans rbgd : :(3)f::(10)." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2E391.

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Etude des systemes kf-prf::(3) et csf-luf::(3) par analyse thermique differentielle et radiocristallographie. Synthese d'une nouvelle serie de composes de formule tlln::(3)f::(10) et caracterisation cristallographique. Etude de proprietes optiques de ces materiaux, le transfert gd**(3+)->eu**(2+) etant envisage pour optimiser l'emission de raie uv 4f**(7)->4f**(7) de l'ion eu**(2+) dans les varietes cubique et hexagonale de rbgd::(3)f::(10). Mise en evidence des deux sites cristallographiques qu'occupe gd par analyse de la fluorescence des niveaux **(6)p::(j) de l'ion gd**(3+) dans la variete hexagonale

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Ashoka, Sahadevan Suchithra. "Anilate-based molecular building blocks for metal-organic frameworks and molecular conductors Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks Nanosheets of Two-Dimensional Neutral Coordination Polymers Based on Near-Infrared-Emitting Lanthanides and a Chlorocyananilate Ligand." Thesis, Angers, 2019. http://bu.univ-angers.fr/Contact.

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Ce travail porte sur la synthèse et la caractérisation de matériaux moléculaires fonctionnels basés sur la molécule anilate et présentant des propriétés de conductivité, de magnétisme et de luminescence. Les anilates sont des dérivés de la 2,5-dihydroxy-1,4-benzoquinone substitués en positions 3 et 6 par une variété d’éléments (H, F, Cl, Br, I, CN, etc). Parmi eux, le seul composé hétérosubstitué ClCNAn2- a été choisi pour préparer une nouvelle famille de polymères de coordination bidimensionnels (PC 2D) avec des métaux de transition ou des ions lanthanides : i) un PC à valence mixte FeIIFeIII, de formule [TAG][FeIIFeIII(ClCNAn)3], contient pour la première fois le cation triaminoguanidinium dans un réseau de coordination.ii) Des PC basés sur le ligand ClCNAn2- et des ions lanthanides émettant dans le proche infrarouge (YbIII, NdIII, ErIII). Ces composés ont été exfoliés en monocouches, et des études de photoluminescence ont été menées à la fois sur les cristaux et les monocouches. iii) Une famille de PC hétéroleptiques basés sur des ions lanthanides et sur deux types de ligands pontants, le ligand ClCNAn2- et des ligands de type carboxylates (DOBDC et F4-BDC). iv) Une famille de PC basés sur des ions DyIII ont été préparés afin d’étudier leur propriétés magnétiques. v) Finalement, la capacité des ligands anilates à se combiner à des conducteurs moléculaires basés sur le BEDT-TTF a été démontrée à travers la synthèse et l’électrocristallisation de semiconducteurs organiques et de conducteurs magnétiques hybrides avec l’anion [Fe(ClCNAn)3]3-
This work reports on the design, synthesis and characterization of novel anilate-based functional molecular materials showing luminescent, magnetic and/or conducting properties. The family of anilate ligands comprises several derivatives obtained by introducing various substituents (H, F, Cl, Br, I, CN, etc.) at the 3 and 6 positions of the common 2,5-dihydroxy-1,4-benzoquinone framework. Among the anilate ligands, the only known heterosubstituted anilate with Cl/CN substituents at the 3,6 positions, ClCNAn2-, have been selected for preparing a novel family of 2D layered coordination polymers (2D CP) with both 3d metal ions and 4f lanthanide ions, through a general and straightforward synthetic strategy. i) Mixed-valence FeIIFeIII 2D CP, formulated as [TAG][FeIIFeIII(ClCNAn)3], containing, the tris(amino)-guanidinium (TAG) cation for the first time in such 2D networks has been synthesized and thoroughly characterized. ii) 2D CPs based on NIR-emitting lanthanides (YbIII, NdIII, ErIII) and the ClCNAn2- ligand, have been prepared and characterized. These layered compounds were exfoliated to nanosheets, by sonication-assisted solution synthesis. Time-resolved photoluminescence studies performed on both the bulk and nanosheets are also highlighted. iii) Novel family of heteroleptic 2D CPs based on NIR-emitting lanthanides and mixed ligands (ClCNAn2- and carboxylate ligands (DOBDC and F4-BDC)), were prepared and characterized. vi) Novel family of 2D CPs based on DyIII and ClCNAn2- were prepared in order to investigate their magnetic properties. v) Furthermore, the ability of anilate ligands to work as components of BEDT-TTF- based molecular conductors have been demonstrated through the synthesis, via electrocrystallization technique. vi) П-d hybrid multifunctional paramagnetic molecular conductors BEDT-TTF and [Fe(ClCNAn)3]3-) were also studied

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Harani, R. "Studies of electronic properties of mixed transition metal oxide and lanthanide phosphate glasses." Thesis, Brunel University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353991.

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Mihalcea, Ionut. "Crystal chemistry of coordination polymers based on uranyl and mixed uranyl - lanthanide carboxylates." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10119/document.

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Ce travail de thèse décrit la synthèse, l’étude cristallochimique et le comportement thermique de polymères de coordination à base de cations uranyle, ou mixtes uranyle-lanthanide complexés par des ligands carboxylates aromatiques (acide phthalique et dérivés). L’emploi de 7 molécules polycarboxylates a conduit à la formation de plus de 25 nouveaux composés type Uranyl-Organic Framework (UOF) ou hybrides uranyle-organique, ou encore mixtes uranyle-lanthanide-organique. Certains de ces ligands on montré une grande diversité d’arrangements atomiques, avec par exemple, l’isophthalate qui conduit à la formation de 10 complexes de coordination, alors que d’autres (par exemple terephthalate) ont permis d’isoler un seul type d’assemblage. Certaines de ces phases contiennent classiquement des briques de construction inorganiques monomériques ou tétramériques alors que d’autres mettent en évidence des blocs trimériques linéaires ou octamériques originals, ou encore des systèmes de chaînes inorganiques générant des structures à tunnels inédits. Une configuration rare d’interaction cation-cation (CCI ou U=O-U) a été également identifiée dans l’isophthalate à base d’unité octamérique. La synthèse de toutes ces phases a permis une meilleure compréhension des réactions hydrothermales et de l’influence de différents paramètres influant la formation du produit final. Pour les phases obtenues sous formes pures, les comportements thermiques et leur stabilité ont été étudiés. Ces expériences ont permis d’établir des relations entre le précurseur initial, la dégradation thermique et les conditions de formation de l’oxyde final. Les spectres de fluorescence ont été collectés et indiquent des informations sur l’influence de la nature du ligand organique ou du type du motif de construction inorganique
This thesis work concerns the synthesis, crystal structural study and thermal behavior of coordination polymers type uranyl and mixed uranyl-lanthanide aromatic carboxylates. Using a series of 7 aromatic carboxylate ligands, more than 25 new uranyl (so-called Uranyl-Organic Framework or UOF) and mixed uranyl-lanthanide coordination polymers have been synthesized and described in this manuscript. Some of the ligands have proven to be very prolific such as the isophthalic acid, which is present in 10 coordination polymers and with others (such as terephthalic acid) only one complex could be isolated. Some of the obtained phases contain typical monomeric or tetrameric SBUs and others possess unique features such as octanuclear SBU with an edge sharing CCI (U=O-U), linear trinuclear SBU or polymeric SBU delimiting large tunnel systems. The synthesis of all these phases conducted to a better understanding of the hydrothermal reactions and the influence of different parameters over the final reaction product. For each of the phases obtained pure the thermal behavior and thermal stability have been studied. These experiments offer a better understanding of the relation between the structure of the initial complex, the thermal degradation conditions and the nature of final oxide. Also for these phases the fluorescence emission spectra were recorded, offering information about the influence of different ligands or different type of SBUs over the typical uranyl spectrum

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Couchman, Samantha M. "Syntheses and structural studies of complexes of mixed donor pyridine/phenol and pyridine/pyrazole ligands." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299312.

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Silva, Adélia Maria Lima da. "Análise térmica aplicada à síntese e caraterização de óxidos mistos de níquel e terras raras." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-26082014-154405/.

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Este trabalho apresenta um estudo sistemático sobre síntese, caracterização e análise térmica aplicada a óxidos mistos dos tipos TR2NiO4 [TR = La, Eu e Y (III)] e TRNiO3 [TR = Pr, Nd e Sm (III)]. Os primeiros óxidos foram obtidos a partir da decomposição térmica de acetatos de terras raras e níquel utilizando-se três métodos distintos: (1) mistura mecânica; (2) evaporação do solvente e (3) cristalização com acetona. Os acetatos simples e binários foram caracterizados por análise elementar, espectroscopia de absorção na região do infravermelho, difração de raios X, TG/DTG, DSC e DTA. Os resultados revelaram a formação de sais binários quando utilizaram-se os métodos 2 e/ou 3. Os produtos da decomposição térmica foram basicamente os óxidos individuais e após tratamento térmico obteveram-se os óxidos desejados. Os óxidos TRNiO3 foram preparados através de três métodos diferentes: (1) mistura de óxidos; (2) precipitação simultânea de hidróxidos e (3) processo sol-gel. Estas amostras foram sinterizadas em temperaturas 650 ≤ T ≤ 1000°C e sob pressões de até 70 atm de O2, caracterizadas por difração de raios X, resistividade elétrica, microscopia eletrônica de varredura e calorimetria exploratória diferencial. Os resultados indicaram que o método sol-gel produziu óxidos monofásicos. Os outros dois métodos, mistura de óxidos e hidróxidos, produziram a fase desejada e traços dos óxidos individuais. Desta forma, concluiu-se que a escolha do método a ser utilizado é fundamental para a obtenção do óxido misto desejado.
This work reports a systematic study on the synthesis, characterization and thermal analysis applied of mixed oxides type-TR2NiO4 [TR = La, Eu e Y (III)] e typeTRNiO3 [TR = Pr, Nd e Sm (III)]. The first oxides were prepared through thermal decomposition of rare earth and nickel acetates, which were synthesized by three methods: (1) mechanical mixture; (2) solvent evaporation and (3) crystallization with addition of acetone. The simply and binary acetates were characterized by elementare analyses, infrared spectroscopy, X ray diffraction, TG/DTG, DSC and DTA. The results revealed formation of binary salts when was used the second and/or third methods. The products of thermal decomposition were single oxides, but after thermal treatment were obtained the single phase of materials. The last oxides were prepared through three different methods: (1) mixture of oxides; (2) simultaneous precipitation of hydroxides and (3) sol-gel process. Samples were sintered at temperatures between 650 ≤ T ≤ 1000°C and under oxygen pressures until 70 atm, characterized by X ray diffraction, electrical resistivity, scanning electron microscopy and differential scanning calorimetry. The results revealed that the sol-gel method produced single phase oxides. The other two methods, mixture of oxides and hydroxides, led to have this phase with traces of single oxides. Therefore, it was concluded that the method used is fundamental to get the desired mixed oxides.

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Paganini, Paula Pinheiro. "Síntese e caracterização de nanopartículas de óxido misto de estanho/titânio dopadas com lantanídeos para marcação biológica." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-15042013-141559/.

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Este trabalho apresenta a síntese, caracterização e estudo fotoluminescente de nanopartículas à base de óxido misto de estanho e titânio dopadas com európio, térbio e neodímio visando à utilização como marcadores luminescentes em sistemas biológicos. As sínteses foram feitas pelos métodos de coprecipitação, sol-gel proteico e Pechini e as partículas foram caracterizadas por espectroscopia de infravermelho, análise termogravimétrica, microscopia eletrônica de varredura, difração de raios X e espectroscopia de absorção de raios X. Os estudos das propriedades fotoluminescentes foram realizados para os luminóforos dopados com európio, térbio e neodímio, sintetizados pelo método de coprecipitação. Para o luminóforo dopado com európio foi possível calcular os parâmetros de intensidade e o rendimento quântico e este apresentou resultados satisfatórios. Tratando-se de uma marcação em sistemas biológicos fez-se necessário a funcionalização destas partículas para que as mesmas se liguem à parte biológica a ser estudada. Sendo assim, funcionalizou-se as nanopartículas pelos métodos de microondas e Stöber e caracterizou-se por espectroscopia de infravermelho, microscopia eletrônica de varredura, espectroscopia por dispersão de energia e difração de raios X, obtendo-se resposta qualitativa da eficácia da funcionalização. O método espectroscópico da ninidrina foi utilizado para a quantificação da funcionalização dos luminóforos. Os estudos fotoluminescentes das partículas funcionalizadas demonstram a viabilidade do uso destes luminóforos como marcadores luminescentes.
This work presents the synthesis, characterization and photoluminescent study of tin and titanium mixed oxide nanoparticles doped with europium, terbium and neodymium to be used with luminescent markers on biological systems. The syntheses were done by co-precipitation, protein sol-gel and Pechini methods and the nanoparticles were characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, X-ray diffraction and X-ray absorption spectroscopy. The photoluminescent properties studies were conducted for luminophores doped with europium, terbium and neodymium synthesized by coprecipitation method. For luminophore doped with europium it was possible to calculate the intensity parameters and quantum yield and it showed satisfactory results. In the case of biological system marking it was necessary the functionalization of these particles to allow them to bind to the biological part to be studied. So the nanoparticles were functionalized by microwave and Stöber methods and characterized by infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction obtaining qualitative response of functionalization efficacy. The ninhydrin spectroscopic method was used for quantification of luminophores functionalization. The photoluminescent studies of functionalized particles demonstrate the potential applying of these luminophores as luminescent markers.

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Wylezich, Thomas Lukas [Verfasser], Nathalie [Akademischer Betreuer] Kunkel, Nathalie [Gutachter] Kunkel, Tom [Gutachter] Nilges, and Philippe [Gutachter] Goldner. "Luminescence of Lanthanide Doped Mixed Anionic Hydrides and Complex Hydrides / Thomas Lukas Wylezich ; Gutachter: Nathalie Kunkel, Tom Nilges, Philippe Goldner ; Betreuer: Nathalie Kunkel." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1220321362/34.

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Частини книг з теми "Mixed Lanthanides"

Hirai, Yuichi. "Luminescent Lanthanide-Mixed Coordination Polymers for Tunable Temperature-Sensitivity." In Assembled Lanthanide Complexes with Advanced Photophysical Properties, 35–45. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8932-9_3.

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Trojan, Kathleen L., William E. Hatfield, Keith D. Kepler, and Martin L. Kirk. "BIS(Phthalocyaninato) Lanthanide Sandwich Compounds Exhibiting Mixed Valence Ligands." In Mixed Valency Systems: Applications in Chemistry, Physics and Biology, 383–88. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3606-8_28.

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Saitzek, Sébastien, ZhenMian Shao, Alexandre Bayart, Pascal Roussel, and Rachel Desfeux. "Microstructure and Nanoscale Piezoelectric/Ferroelectric Properties in Ln2Ti2O7(Ln= Lanthanide) Thin Films with Layered Perovskite Structure." In Perovskites and Related Mixed Oxides, 233–58. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527686605.ch11.

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González, F., C. Pesquera, and C. Blanco. "Characterization and Catalytic Performance of Montmorillonites with Mixed Aluminium/Lanthanide Pillars." In Pillared Clays and Related Catalysts, 43–65. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-6670-4_3.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of polymeric mixed metal lanthanide-copper complex with diglycolic acid." In Magnetic Properties of Paramagnetic Compounds, 13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_2.

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Huaizhu, Ma, and Ye Zhongwen. "SYNTHESIS OF MIXED LIGAND LANTHANIDE ORGANOMETALLICS INVOLVING CYCLOPENTADIENYL AND β-DIKETO CHELATE LIGANDS." In New Frontiers in Rare Earth Science and Applications, 134–38. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-12-767661-6.50035-7.

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Chapelet-Arab, B., S. Grandjean, G. Nowogrocki, and F. Abraham. "Synthesis and Crystal Structure Determination of Some Mixed Oxalates of Actinide(s) and/or Lanthanide and Monovalent Cations (NH4+ or N2H5+)." In Recent Advances in Actinide Science, 240–42. The Royal Society of Chemistry, 2006. http://dx.doi.org/10.1039/bk9780854046782-00240.

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IFTIKHAR, K. "MIXED LIGAND LANTHANIDE COMPLEXES. PARAMAGNETIC SHIFTS INDUCED BY Eu(fod)3pz and Yb(fod)3 pz IN THE NMR SPECTRUM OF DI-1-BUTYL ETHER." In New Frontiers in Rare Earth Science and Applications, 121–26. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-12-767661-6.50032-1.

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Тези доповідей конференцій з теми "Mixed Lanthanides"

Menzel, E. R., and Clay Allred. "Lanthanide mixed ligand chelates for DNA profiling and latent fingerprint detection." In Enabling Technologies for Law Enforcement and Security, edited by John Hicks, Peter R. De Forest, and Vivian M. Baylor. SPIE, 1997. http://dx.doi.org/10.1117/12.266301.

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Звіти організацій з теми "Mixed Lanthanides"

Clearfield, Abraham. Mixed Metal Phosphonate- Phosphate Resins for Separation of Lanthanides from Actinides. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1407693.

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