Thèses sur le sujet « CALCIUM BISMUTH »
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Bouhajib, Abderrahim. « Étude thermodynamique des systèmes bismuth-calcium et calcium-antimoine : calorimétrie, analyse thermique et modélisation numérique des diagrammes de phases ». Nancy 1, 1990. http://www.theses.fr/1990NAN10204.
Texte intégralMARTINELLI, ANTONIO E. « Efeito da adicao de chumbo na formacao de fases supercondutoras em ceramicas de Bi-Sr-Ca-Cu-O ». reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10260.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Kim, Seong-Jin. « Directional crystallization in the bismuth-strontium-calcium-copper-oxygen system : Effect of phase separation ». Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/186040.
Texte intégralWan, Xuewen. « Effects of longitudinal disorder on the magnetic field distribution in bismuth strontium calcium copper oxide ». W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539623413.
Texte intégralKim, Cheol Jin. « Laser float zone growth of superconducting bismuth strontium calcium copper oxide fibers : Characterization and phase equilibria ». Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1059411650.
Texte intégralBania, William Roger 1964. « Spray pyrolysis processing of yttrium-barium-copper-oxide and bismuth-strontium-calcium-copper-oxide superconducting thin films ». Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277080.
Texte intégralMilliken, Damion Alexander. « Uranium doping of silver sheathed bismuth-strontium-calcium-copper-oxide superconducting tapes for increased critical current density through enhanced flux pinning ». Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20040810.154223/index.html.
Texte intégralBouirden, Lahcen. « Transformations continues et discontinues dans les alliages de plomb microalliés au calcium et au calcium étain pour batteries d'accumulateurs : influence de la vitesse de refroidissement : rôle des impuretés argent, aluminium et bismuth ». Nancy 1, 1990. http://www.theses.fr/1990NAN10205.
Texte intégralAntunes, Laurent. « Caractérisation de composites supraconducteurs aléatoires - phases au bismuth/argent : contribution à l'étude des jonctions faibles dans ces matériaux ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 1998. http://tel.archives-ouvertes.fr/tel-00163366.
Texte intégralRowan, Fraser S. « A study of the effects of oxygen environment on the stoichiometry, phase assemblage and stability of BiSCCO 2212 and 2201 using EPMA ». Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369139.
Texte intégralBalmer, B. R. « Processing studies on Bi-2212 superconducting thick films ». Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326142.
Texte intégralGay, Pierre. « Ultrafast processes in high temperature superconductors ». Thesis, University of Oxford, 2000. https://ora.ox.ac.uk/objects/uuid:140cc366-58a1-41ad-919b-2cb5f65c3fe9.
Texte intégralRichens, P. E. « High temperature superconductors in electromagnetic applications ». Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365792.
Texte intégralBolt, Livia. « Magnetic separation using high-Tâ†c superconductors ». Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368332.
Texte intégralSaleh, Paul Matthew. « Characterisation of practical high temperature superconductors in pulsed magnetic fields and development of associated technology ». Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365786.
Texte intégralLloyd, Sion. « The magnetic properties of superconductors ». Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343847.
Texte intégralFeltham, Stuart Paul. « An investigation of stoichiometetry and thermo-mechanical processing parameters of (Pb,Bi)â†2Srâ†2Caâ†2Cuâ†3Oâ†x superconducting tapes ». Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368331.
Texte intégralPavard, Sybille. « Texturation de massifs supraconducteurs Bi2Sr2CaCu2O(8+x) avec ajout de MgO ». Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10029.
Texte intégralAYADI, MOHAMED. « Contribution a l'etude de la dynamique de reseau de quelques composes de la serie de la mathlockite (pbfcl) ». Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13183.
Texte intégralNoudem, Jacques Guillaume. « Texturation des céramiques supraconductrices Bi-Pb-Sr-Ca-Cu-O par combinaison des effets du champ magnétique et de la contrainte uniaxiale à haute température ». Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10169.
Texte intégralAzzaoui, Mouhsine. « Modélisation des liquides métalliques ternaires pour le calcul des diagrammes d'équilibre à partir des mesures thermodynamiques ciblées : systèmes tests : (Pb, Sn, Sb), (Pb, Sn, Bi), (Pb, Sn, Ca) ». Nancy 1, 1995. http://www.theses.fr/1995NAN10032.
Texte intégralTimrov, Iurii. « Étude ab initio des plasmons et du couplage électron-phonon dans le bismuth : de la modélisation de l'absorption des porteurs libres à une nouvelle méthode pour le calcul de spectre de perte d'énergie électronique ». Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00823758.
Texte intégral温國宏. « Films Thickness Dependence of Ferroelectric and Photovoltaic Properties of Calcium Doped Bismuth Ferrite ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/47260632657294266642.
Texte intégral國立新竹教育大學
應用科學系碩士班
103
In this experiment, the photovoltaic effect with different film thickness of 5% Ca doped BiFeO3 thin films were investigated. The probable physical mechanism were carried out many different measurements which may affect the efficiency of the photovoltaic effect. The specimen of BFO thin films and the electrode were all deposited on Si(100) by RF magnetron sputtering. First, we grew LaNiO3 on Si(100) at 450 . Second, The 5% Ca doped BiFeO3 films were deposited on LaNiO3. Third, we deposited Pt or AZO to do measurements, respectively. Film thickness was estimated by SEM and X-ray reflectivity. Film crystallinity was carried out by X-ray diffraction measurement. The morphology was measured by atomic force microscope and X-ray reflectivity. The hysteresis loop was performed by TF-2000 and the photovoltaic effect were measured by 405 nm laser. BFO was (100) highly preferred along Si (100) substrate from X-ray diffraction measurement. BFO film strain relax as film thickness increase, hence the diffraction peak position shift more close to the expected bulk value. The surface roughness, which was carried out by AFM and X-ray reflectivity has little increase as film thickness thicker. The hysteresis loop showed that the polarization slow down as the film thickness increased. The photovoltaic effect also slow down as the film thicker. The BFO built-in electric field affect the efficiency of photovoltaic effect. As the film thickness increased to 100 nm, the strain relax caused built-in electric field become weaker and the probability of electron and hole recombined increase due to distance between two electrode; therefore, the efficiency of photovoltaic hidden.
Cai, Ren-Fong, et 蔡任豐. « Preparation and Photocatalytic Activity Study of Calcium Bismuth Oxide Photocatalysts with Core-shell Structure ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/bp52c7.
Texte intégral國立東華大學
材料科學與工程學系
95
Core-shell structure calcium bismuth oxide photocatalysts prepared by chemical impregnation method. The result indicated adding HNO3 can promoted the reaction. From the different reaction temperature experiments, we found that in the 500℃and 550℃have the best photocatalysic activities. Reacted in the 550℃,generated special band structure due to the core-shell structure. It makes the electron-hole pairs separated well. From the different reaction temperature and time experiments, when the reaction temperature in the 450℃, a lot of Bi5O7NO3 were formed, and it decomposed during the second reaction. Temperature is the main factor of the calcium bismuth oxide phase formation. In the same reaction temperature, its phase are the same, and the phase ratio are slight different. The Ca/Bi ratio is the important factor during the reaction. The higher Ca/Bi ratio, the better photocatalytic activities are observation, and the reacted in the 500℃ photocatalysts photocatalytic activities are better than reacted in the 450℃.
Cho, Jae-Ik. « The influence of trace element effects of calcium, phosphorus and bismuth in aluminum casting alloys ». 1999. http://catalog.hathitrust.org/api/volumes/oclc/44538989.html.
Texte intégralPires, Tatiana Rafaela Lopes. « Comparative analysis of chromatic alterations of a Calcium Silicate-based Material : in vitro study ». Master's thesis, 2014. http://hdl.handle.net/10316/36720.
Texte intégralObjective: The purpose of this study was to investigate and compare chromatic alterations of an inorganic silicate-based cement, also known as white mineral trioxide aggregate (WMTA), submitted to different environmental conditions using the CIE L*a*b* system evaluated by two different methods. Methods: Twenty-four samples of WMTA (ProRoot® MTA, Dentsply Tulsa Dental, Johnson City, TN) were randomly distributed in four groups (n=4). In group 1 the samples did not undergo any additional treatment (negative control group). In group 2 WMTA samples were light irradiated for 60 seconds using a LED poliwave curing unit. In group 3 and 4 WMTA samples were coated with a layer of glycerine and adhesive, respectively and light irradiated for 60 seconds. A commercial spectrophotometer (VITA Easyshade® Advance 4.0, VidentTM, California, USA) and calibrated photographic digital analysis were used to determine colour coordinates from the CIE L*a*b* system of each sample after three different time points: 30 minutes, 48 hours and 7 days. In order to understand the chemical alterations associated to colour variations of the material x-ray diffraction analysis was also conducted. Data was analysed using statistical software IBM® SPSS® Statistics, version 20. Results: Consistency between the two colour measuring methods was not observed. Significant colour variation was observed for group 3. X-ray diffraction analysis showed no differences between compounds. Conclusion: WMTA showed significant dark discolouration after irradiation with an LED poliwave curing unit in an oxygen-free environment promoted by glycerine although after 48 hours discolouration had faded. The same light irradiation protocol associated to an oxygen-free conditions achieved by an adhesive resin layer did not induce significant discolouration at the end of the experiment protocol.
Wang-JenLi et 李婉甄. « The effects of calcium and other element substitution on the electric and photoelectric properties of bismuth ferrite ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41204950239370020978.
Texte intégral國立成功大學
材料科學及工程學系碩博士班
101
The aim of this study was to search for ferroelectric photovoltaic materials. In contrast to the semiconductor p-n junction, where the photovoltaic voltage is limited to around 0.6 V, the spontaneous polarization in ferroelectric materials can produce a much higher output voltage. Indeed, in a recent work, a large photovoltaic output of over 20 V has been demonstrated with the BiFeO3 single crystals. However, because ferroelectric materials usually have a very high DC resistivity over 108 ohm-cm, there is a need to increase the mobile carrier concentration in these materials. For this purpose, BiFeO3 (BFO) was doped with various ions in the present study. Polycrystalline pellets of BFO:M (M=Ca, Pb, Sr and Ni) were prepared by the sol-gel method. After poling, the photoelectric effects of the samples were studied. X-ray diffraction showed that after sintering at 500~600oC for 12 hours, undoped BFO and the samples doped with Ca, Pb, Sr and Ni had a pure phase with the well-known rhombohedral structure. If the sintering temperature was raised to 700oC, a second phase of the composition Bi25FeO40 appeared. The resistivities of the BFO samples doped with Ca, Pb, Sr, and Ni doped were measured to be 106~107 ohm-cm, which were1~2 orders lower than that of the undoped BFO. The samples were poled under a high electrical field at 600oC. The degree of the achieved poling was checked by the measured d33 values. I-V curves and photovoltaic effects of the samples with a large d33 were then investigated. The experiment results showed that under suitable preparation conditions (e.g. sintering temperature and time, degree of achieved poling, etc.), an open-circuit voltage was usually observed in the samples. After the samples were illuminated by the simulated-sunlight, large current increases were observed in the I-V curves. The undoped BFO showed a largest negative open-circuit voltage of -1.25 V, whereas the open-circuit voltages for Ca and Ni doped BFO were -0.75 and -0.2 (V), respectively. On the other hand, The Ca and Ni doped samples showed the largest photocurrents, which were increased from 10-9 A at dark to 10-8 A after the illumination. The undoped BFO showed a trivial photocurrent after illumination, indicating a lack of mobile charge carrier which could be excited by the light.
Garg, Rohini. « Structural, Ferroelectric, Piezoelectric and Phase Transition Studies of Lead Free (Na0.5Bi0.5)TiO3 Based Ceramics ». Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3446.
Texte intégralGarg, Rohini. « Structural, Ferroelectric, Piezoelectric and Phase Transition Studies of Lead Free (Na0.5Bi0.5)TiO3 Based Ceramics ». Thesis, 2013. http://etd.iisc.ernet.in/2005/3446.
Texte intégralShet, Tukaram. « Investigations into the Microstructure Dependent Dielectric, Piezoelectric, Ferroelectric and Non-linear Optical Properties of Sr2Bi4Ti5O18 Ceramics ». Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3269.
Texte intégralShet, Tukaram. « Investigations into the Microstructure Dependent Dielectric, Piezoelectric, Ferroelectric and Non-linear Optical Properties of Sr2Bi4Ti5O18 Ceramics ». Thesis, 2017. http://hdl.handle.net/2005/3269.
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