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Dissertations / Theses on the topic 'Bismuth titanate'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Sanson, Alessandra. "Modified bismuth titanate piezoelectric ceramics." Thesis, Cranfield University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401625.

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2

Duan, Runrun. "High Curie Temperature Bismuth- and Indium- Substituted Lead Titanate." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06082004-124159/unrestricted/Duan%5FRunrun%5F200407%5Fmast.pdf.

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Thesis (M.S.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2005. Directed by Robert Snyder.<br>Shrout, Thomas, Committee Member ; Snyder, Robert, Committee Member ; Speyer, Robert, Committee Chair. Includes bibliographical references.
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3

Turner, Stuart Lee. "The structure of bismuth ferrite - lead titanate (BiFeO3 - PbTiO3)." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507885.

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4

Palan, Rohit Chandulal. "Pyroelectric Properties of Ferroelectric Lanthanum Bismuth Titanate Thin Films." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1000746504.

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5

Burnett, Timothy Laurence. "Growth and charaterisation of bismuth ferrite lead titanate single crystals." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487709.

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Bismuth ferrite lead titanate (BFPT) shows potential in high temperature piezoelectric and ferroelectric applications as well in the emerging field of multiferroic research. Single crystals of (BFPT) have been grown for the first time using the flux growth method.
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6

Soares-Carvalho, Fernanda. "Elaboration de couches minces ferroélectriques de titanate de bismuth Bi4Ti3O12." Limoges, 1996. http://www.theses.fr/1996LIMOA001.

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7

Stevenson, Timothy James. "Magnetic and electric properties of bismuth ferrite lead titanate ceramics." Thesis, University of Leeds, 2010. http://etheses.whiterose.ac.uk/1371/.

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Solid solutions of multiferroic BiFeO3 doped with ferroelectric PbTiO3 (BFPT) can be prepared by conventional mixed oxide processing to produce a range of polycrystalline ceramics ranging throughout the xBiFeO3 - (1-x)PbTiO3 series. Sintered ceramics are shown to exhibit mixed tetragonal (P4mm) and rhombohedral (R3c) phase perovskite distortions from 0.4 ≤ x < 0.75, where at x ~ 0.75 a morphotropic phase boundary exists and compositions x > 0.75 are entirely rhombohedral. From extensive use of neutron diffraction experiments, the phase coexistence is attributed to compensation for the internal
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8

Wang, Naigang. "Multiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigations." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33854.

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Recently, multiferroics-defined as materials with coexistence of at least two of the ferroelectric, ferroelastic and ferromagnetic effects-have attracted enormous research activities. In this thesis, the structure and properties of multiferrioic BiFeO3-x%PbTiO3 and Fe-x%Ga crystalline solutions were investigated. First, the results show that modified BiFeO3-PbTiO3 based ceramics have significantly enhanced multiferroic properties, relative to BiFeO3 single crystals. The data reveal: (i) a dramatic increase in the induced polarization; and (ii) the establishment of a remnant magnetization by a
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9

Merka, Oliver [Verfasser]. "Yttrium bismuth titanate pyrochlore mixed oxides for photocatalytic hydrogen production / Oliver Merka." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2012. http://d-nb.info/1029589895/34.

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10

Nahime, Bacus de Oliveira [UNESP]. "Síntese e caracterização estrutural de filmes finos Bi4Ti3O12." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/92018.

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Made available in DSpace on 2014-06-11T19:25:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-04-27Bitstream added on 2014-06-13T20:33:16Z : No. of bitstreams: 1 nahime_bo_me_ilha.pdf: 1294512 bytes, checksum: ffc3048caf6b741e23555fbf3b2fbd5e (MD5)<br>Na última década, cresceu consideravelmente o interesse pela produção de filmes finos ferroelétricos, em virtude do grande potencial que estes materiais apresentam para a produção de dispositivos de memória ferroelétrica não-voláteis. O titanato de bismuto, Bi4Ti3O12 (BIT) é um ferroelétrico com estruturas de camadas de bismuto, conhec
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11

Spears, Marlene Ann. "Defect chemistry and electrical properties of ruthenium- and bismuth-substituted gadolinium titanate pyrochlore." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11443.

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12

Sheets, Sossity A. (Sossity Amber) 1973. "Dielectric and electromechanical properties of barium and zirconium co-doped sodium bismuth titanate." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/28621.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2000.<br>Includes bibliographical references (p. 175-179).<br>Compositional exploration was conducted within the alkaline bismuth titanate system by doping on the A- and B- sites with Ba⁺² and Zr⁺⁴, respectively. Results on the phase, dielectric and electromechanical properties of single crystals and polycrystals for this new family of relaxor perovskite ferroelectrics are presented. The actuation and polarization characteristics in this system were found to be highly sensitive (within 2 mol%) to
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13

Matichyn, Serhiy. "Fabrication and characterisation of ferroelectric lead zirconate titanate and strontium bismuth tantalate thin films." [S.l.] : [s.n.], 2006. http://diglib.uni-magdeburg.de/Dissertationen/2006/sermatichyn.htm.

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14

Qaisar, Sayyed Adam. "Fatigue and high temperature behaviour of the La-doped bismuth-ferrite lead-titanate system." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/5556/.

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For the past fifty years, lead zirconate titanate (PZT) has been the material of choice for the piezoelectric industry with piezoelectric materials showing promise in their applicability to smart devices and structures, from adaptive optics to ultrasonics and sonar. The longevity and reliability of PZT is, as with any commercial material, a topic that is well documented with reported operating lifetimes as large as 109 cycles. However PZT is severely limited in the type of thermal environment it can sustainably operate in, with maximum operating temperatures conservatively set around 150°C for
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15

Khan, Mikael Ali. "Preparation and properties of bismuth ferrite-lead titanate thin films prepared by pulsed laser deposition." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485633.

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Development of ferroelectric thin films has been a subject of intensive investigation in recent years due to their promise in next· generation electronic devices. This report encompasses an· initial investigation into the pulsed laser deposition of thin films of bismuth ferrite-lead titanate (l-x)BiFe03-xPbTi03 (BFPT) on platinized silicon (Pt/Si) substrates. The work presented lays down optimised processing conditions for the preparation of BFPT thin films on Pt/Si substrates and presents an understanding of structure-property relationships of this material system thereby providing a fi
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16

Nahime, Bacus de Oliveira. "Síntese e caracterização estrutural de filmes finos Bi4Ti3O12 /." Ilha Solteira : [s.n.], 2007. http://hdl.handle.net/11449/92018.

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Orientador: Eudes Borges de Araújo<br>Banca: Marco Antonio Utrera Martines<br>Banca: José de los Santos Guerra<br>Resumo: Na última década, cresceu consideravelmente o interesse pela produção de filmes finos ferroelétricos, em virtude do grande potencial que estes materiais apresentam para a produção de dispositivos de memória ferroelétrica não-voláteis. O titanato de bismuto, Bi4Ti3O12 (BIT) é um ferroelétrico com estruturas de camadas de bismuto, conhecido por apresentar elevada temperatura de Curie (Tc), próxima de 650ºC, e excelentes propriedades de fadiga ferroelétrica. Este trabalho teve
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17

Steiner, Sebastian [Verfasser], Till [Akademischer Betreuer] Frömling, and Kyle [Akademischer Betreuer] Webber. "Defect Chemistry of Sodium Bismuth Titanate and its Solid Solutions / Sebastian Steiner ; Till Frömling, Kyle G. Webber." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207999822/34.

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18

Steiner, Sebastian [Verfasser], Till [Akademischer Betreuer] Frömling, and Kyle G. [Akademischer Betreuer] Webber. "Defect Chemistry of Sodium Bismuth Titanate and its Solid Solutions / Sebastian Steiner ; Till Frömling, Kyle G. Webber." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207999822/34.

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19

AMARAL, Thiago Martins. "Estudos da sinterização de Bi12TiO20 (BTO) visando obter cerâmicas transparentes." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/804.

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Made available in DSpace on 2014-07-29T15:07:08Z (GMT). No. of bitstreams: 1 Mestrado_Thiago_Martins_Amaral.pdf: 3609467 bytes, checksum: ece5cabfa428decf86242ad3624c5852 (MD5) Previous issue date: 2011-02-16<br>This work presents the systematic results of studies concerning the sintering of the Bi12TiO20 (BTO) aiming the production of transparent ceramic samples. All that because the BTO is a material that has great scientific and technologic visibility due to its optical, electro and electro-optical properties, but still little explored as ceramic. The sintering starting material was obtai
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20

Lee, Sung-Kyun. "Growth, microstructure and ferroelectric properties of non-c-axis-oriented rare earth substituted bismuth titanate thin films and nanostructures." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=980161304.

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21

Coathup, David James. "The effect of interface layers and doping on the multiferroic properties of bismuth titanate oxide thin films on silicon." Thesis, Aston University, 2017. http://publications.aston.ac.uk/38210/.

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For the development of magnetoelectric memory devices, the development of artificial magnetoelectric materials is necessary. Previous work in the field had focused on the multiferroic properties of this material in bulk form, however, for a practical device, a thin film investigation is needed. This thesis details the author's investigation into the multiferroic properties of bismuth titanate oxide, Bi4Th012, (BTO) thin films doped with lanthanum, niobium, iron and cobalt, to form the novel material Bi3.2slao.7sLTb.sNbo.2sFeo.mCoo.m012 (BTFC), and how different interface layers influence their
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22

Schmitt, Veronika [Verfasser], and Josef [Akademischer Betreuer] Breu. "Effect of Dopants on the Local Atomic Structure and Sintering Behavior of Bismuth Sodium Titanate / Veronika Schmitt. Betreuer: Josef Breu." Bayreuth : Universität Bayreuth, 2014. http://d-nb.info/1059352346/34.

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23

Dittmer, Robert [Verfasser], Jürgen [Akademischer Betreuer] Rödel, and Karsten [Akademischer Betreuer] Albe. "Lead-Free Piezoceramics – Ergodic and Nonergodic Relaxor Ferroelectrics Based on Bismuth Sodium Titanate / Robert Dittmer. Betreuer: Jürgen Rödel ; Karsten Albe." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/1107771757/34.

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24

Pacher, Fernandes Rodrigo [Verfasser]. "Piezoresponse Force Microscopy study of potassium sodium niobate and bismuth sodium titanate based lead-free ferroelectric materials / Rodrigo Pacher Fernandes." München : Verlag Dr. Hut, 2014. http://d-nb.info/1049362829/34.

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25

Gatsa, Oleksandr. "Development of acoustic sensors for the extension of measurements to high temperature in the experimental reactors." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS092/document.

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Ce travail de thèse porte sur l’étude et la réalisation d'une nouvelle génération de capteurs ultrasonore dédiés à la caractérisation des gaz de fission. Plus généralement, ces études concernent le développement de l’instrumentation du réacteur d’essai des matériaux Jules Horowitz (RJH), visant entre autre à effectuer le contrôle in situ de la composition du gaz libéré afin d’optimiser la durée de vie du combustible et le taux de combustion. La température de fonctionnement de ce nouveau réacteur devant se situer dans la plage entre 200 °C à 400 °C, la principale problématique concerne donc le
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26

Schuisky, Mikael. "CVD and ALD in the Bi-Ti-O system." Doctoral thesis, Uppsala University, Department of Chemistry, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-552.

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<p>Bismuth titanate Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub>, is one of the bismuth based layered ferroelectric materials that is a candidate for replacing the lead based ferroelectric materials in for instance non-volatile ferroelectric random access memories (FRAM). This is due to the fact that the bismuth based ferroelectrics consists of pseudo perovskite units sandwiched in between bismuth oxide layers, which gives them a better fatigue nature.</p><p>In this thesis thin films of Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12 </sub>have been deposited by chemical vapour deposition (CVD) using the m
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27

Bousquet, Marie. "Croissance, caractérisations et étude des propriétés physiques de films minces du matériau ferroélectrique Na0,5Bi0,5TiO3." Limoges, 2010. http://aurore.unilim.fr/theses/nxfile/default/43e4e73f-32af-463d-9709-401209acea22/blobholder:0/2010LIMO4062.pdf.

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Ce travail est consacré à l'élaboration par ablation laser et à la caractérisation de couches minces épitaxiées du matériau ferroélectrique sans plomb Na0,5Bi0,5TiO3 (NBT). Dans un premier temps, nous avons déterminé les conditions de synthèse de couches minces monophasées de NBT, étape délicate où un contrôle rigoureux de la composition chimique est nécessaire afin d'éviter l'apparition de phases secondaires (pyrochlore, phases d'Aurivillius. . . ). Les premières mesures électriques macroscopiques et à l'échelle locale ont permis d'attester du comportement ferroélectrique des films préparés,
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28

Vijay, Dilip P. "Reliability and processing of ferroelectric thin film capacitors with emphasis on fatigue and etching." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162341/.

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29

Wollmann, Philipp. "Synthese und Funktion nanoskaliger Oxide auf Basis der Elemente Bismut und Niob." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-85784.

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Am Beispiel von ferroelektrischen Systemen auf Bismut-Basis (Bismutmolybdat, Bismutwolframat und Bismuttitanat) und von Strontiumbariumniobat werden neue Möglichkeiten zur Synthese solcher Nanopartikel aufgezeigt. Die Integration der Nanopartikel in transparente Nanokompositmaterialien und die Entwicklung neuer Precursoren für die Herstellung von Dünnschichtproben gehen den Untersuchungen zur Anwendung als elektrooptische aktive Materialien voraus. Durch weitere Anwendungsmöglichkeiten in der Photokatalyse, dem Test dampfadsorptiver Eigenschaften mit Hilfe eines neuartigen Adsorptionstesters (
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30

Mathey, Pierre. "Développement d'une nouvelle méthode d'amplification et optimisation des amplificateurs photo réfractifs d'images : application a la déflexion de faisceaux." Phd thesis, Université Paris Sud - Paris XI, 1992. http://pastel.archives-ouvertes.fr/pastel-00714198.

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Cette étude s'attache a l'optimisation de faisceaux par mélange a deux ondes dans des cristaux photorefractifs et a leur emploi dans des dispositifs d'amplification d'images et dans un système de déflexion. Dans un premier temps, nous démontrons que l'application au cristal d'un champ électrique pulse périodique renforce le transfert d'énergie dans le mélange a deux ondes. L'étude analytique du phénomène montre que la technique des champs pulses permet de dépasser la limite d'amplification commune aux autres méthodes d'amplification. Cette technique ne permet pas cependant d'amplifier simultan
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31

Aguiar, Ederson Carlos de [UNESP]. "Desenvolvimento de cerâmicas texturizadas de titanato de bismuto puro e dopado com nióbio." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/102560.

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Made available in DSpace on 2014-06-11T19:32:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-11-26Bitstream added on 2014-06-13T20:42:52Z : No. of bitstreams: 1 aguiar_ec_dr_araiq.pdf: 2825912 bytes, checksum: 6b9c3aa9260f3f9e3707127beafc008a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>No presente trabalho foram preparados pós cerâmicos de Bi4Ti3O12 estequiométrico, com excesso de bismuto e com excesso dopados com nióbio pelo método dos precursores poliméricos. As fases cristalinas
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Aguiar, Ederson Carlos de. "Desenvolvimento de cerâmicas texturizadas de titanato de bismuto puro e dopado com nióbio /." Araraquara : [s.n.], 2009. http://hdl.handle.net/11449/102560.

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Orientador: José Arana Varela<br>Banca: Mário Cilense<br>Banca: Valmor Roberto Mastelaro<br>Banca: Daniel Zanetti de Flório<br>Banca: Eliana Navarro dos Santos Muccillo<br>Resumo: No presente trabalho foram preparados pós cerâmicos de Bi4Ti3O12 estequiométrico, com excesso de bismuto e com excesso dopados com nióbio pelo método dos precursores poliméricos. As fases cristalinas foram obtidas por calcinação a 700 °C-4h com 10% excesso Bi nas composições Bi4Ti3-xNbxO12 (x = 0; 0,1; 0,2 e 0,4 mol% Nb). Os pós obtidos foram caracterizados quanto ao tamanho das partículas, difratometria de raios X,
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33

Vögler, Malte [Verfasser], Jürgen [Akademischer Betreuer] Rödel, and Bai-Xiang [Akademischer Betreuer] Xu. "Mechanisches Verhalten von Natrium-Bismut-Titanat Piezokeramiken / Malte Vögler ; Jürgen Rödel, Bai-Xiang Xu." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1162621699/34.

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34

Nogueira, André Esteves. "Síntese e propriedades fotocatalíticas do titanato de bismuto obtido pela rota dos complexos oxidantes de peróxido." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/6321.

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Made available in DSpace on 2016-06-02T20:34:57Z (GMT). No. of bitstreams: 1 6280.pdf: 4766963 bytes, checksum: 97442ca9a5e01a854db70de4f1436df4 (MD5) Previous issue date: 2014-08-14<br>Universidade Federal de Minas Gerais<br>The welfare of the population and technological progress of our society largely depend on the development and the intensive use of synthetic materials, generating a large amount of residual chemicals and high energy consumption. Therefore, the need for development of synthesis routes that are more efficient, economic and environmentally sustainable, both for obtaining n
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Elkechai, Omar. "Céramiques ferroélectriques dans les systèmes NaBiTiO3 - KBiTiO3,NaBiTiO3 - PbTiO3 et KBiTiO3 - PbTiO3." Limoges, 1995. http://www.theses.fr/1995LIMO0018.

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Ce travail concerne l'elaboration et les caracterisations structurales, electriques et piezoelectriques des compositions ceramiques appartenant aux systemes: (nbt - kbt) na#(#0#. #5#)k#xbi#0#. #5tio#3 (0 x 0. 08 ; 0. 3 x 0. 5) (nbt - pt) (na#0#. #5bi#0#. #5)#(#1#-#x#)pb#xtio#3 (0 x 0. 1 ; 0. 18 x 1) (kbt - pt) (k#0#. #5bi#0#. #5)#(#1#-#x#)pb#xtio#3 (0 x 1) la synthese des solutions solides est realisee sous forme de poudre polycristalline par reaction a l'etat solide. L'etude par diffraction x a permis d'etablir l'evolution structurale de ces compositions ainsi que les domaines d'existence des
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BONTURIM, EVERTON. "Controle de propriedades multiferroicas em filmes finos óxidos dopados com íons terras raras para aplicação como dispositivos lógicos e de memória." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28033.

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Submitted by Pedro Silva Filho (pfsilva@ipen.br) on 2017-11-22T14:03:18Z No. of bitstreams: 0<br>Made available in DSpace on 2017-11-22T14:03:18Z (GMT). No. of bitstreams: 0<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Nas últimas décadas, o consumo de dispositivos eletrônicos e a alta demanda por armazenamento de dados tem mostrado grandes oportunidades para a criação de novas tecnologias que garantam as necessidades mundiais na área de computação e desenvolvimento. Alguns materiais multiferr
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Ferreira, Rudson da Conceição. "Produção de BI4TI3O12 via rota sol-gel modificada." Pós-Graduação em Física, 2013. https://ri.ufs.br/handle/riufs/5308.

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The main goal of this study was to develop a methodology for the production of Bismuth Titanate ceramics in the phase Bi4Ti3O12, based on sol-gel route and using polyvinyl alcohol (PVA) as polymerizing agent. Bi4Ti3O12 is a ferroelectric material with great technological appeal due to its potential application in capacitors and memory devices. Moreover, the sol-gel route with PVA, besides enabling particle size control and low contamination during the synthesis, has the advantage of using less expensive reagents than those used in conventional route. The results indicated that ceramic bodies w
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Nguyen, Lucie. "Approche du frittage et du co-frittage de matériaux céramiques et métalliques pour l'élaboration par le procédé d'impression jet d'encre de composants magnétiques." Limoges, 2013. http://www.theses.fr/2013LIMO4005.

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Ce travail est consacré à l’étude du frittage de matériaux céramiques et métalliques en vue de leur co-frittage pour l’élaboration d’un composant magnétique mis en forme par un procédé d’impression jet d’encre. L’étude et la compréhension du frittage du matériau isolant (à base de silice) avec ou sans additifs de type TiO2, Bi2O3, ZnO se sont appuyées sur l’identification in situ par MEBE et DRX des transformations de phases et des mécanismes de densification intervenant au cours du traitement thermique. Il a été notamment montré que ces additifs pouvaient jouer le rôle soit de modificateur so
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Santos, Denise de Jesus. "Produção e estudo dos defeitos de materiais fotossensíveis com estrutura cristalina do tipo silenita." Pós-Graduação em Física, 2014. https://ri.ufs.br/handle/riufs/5317.

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Photorefractive BTO presents useful properties for applications such as real-time holography, coherent light amplification and optical information processing, among others. The performance strongly depends on the defects induced by impurities, which can act as charge donors or acceptors. Defects can also be created by doping so that the properties can be adjusted to the desired application. Since ceramic reproduce well the single crystal properties and have advantages such as the simplicity and low cost of processing, they become suitable for the study of the relationship between properties a
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Yu, Xiang. "Photocatalytic conversion of methane and reduction of CO2 with H2O." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R022/document.

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La photocatalyse est l'une des technologies clés pour les applications liées à l'énergie propre et à l'environnement. Le nombre d'applications basées sur la photocatalyse a considérablement augmenté au cours des deux dernières décennies.L'activation photocatalytique des liaisons C-H est un domaine émergent. Cependant, en raison de sa grande stabilité, une grande quantité d’énergie est habituellement consommée pour sa conversion, ce qui reste un problème à résoudre. La conversion du méthane et le mécanisme réactionnel qui se produisent sur les nanocomposites métal-hétéropolyacide-oxyde de titan
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41

Yu, Xiang. "Photocatalytic conversion of methane and reduction of CO2 with H2O." Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR022.

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La photocatalyse est l'une des technologies clés pour les applications liées à l'énergie propre et à l'environnement. Le nombre d'applications basées sur la photocatalyse a considérablement augmenté au cours des deux dernières décennies.L'activation photocatalytique des liaisons C-H est un domaine émergent. Cependant, en raison de sa grande stabilité, une grande quantité d’énergie est habituellement consommée pour sa conversion, ce qui reste un problème à résoudre. La conversion du méthane et le mécanisme réactionnel qui se produisent sur les nanocomposites métal-hétéropolyacide-oxyde de titan
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42

Niu, Feng. "Development of novel catalysts for selective amination of alcohols." Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR068.

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Les amines sont des intermédiaires très importants pour l’industrie chimique et la science de la vie, qui peuvent être synthétisés par différentes voies traditionnelles. L’amination catalytique d’alcools à base de métaux via le mécanisme dit “d'emprunt d'hydrogène” est un moyen relativement efficace et respectueux de l’environnement pour la synthèse de différentes amines primaires. Toutefois, certains problèmes subsistent, tels que le coût élevé des métaux nobles, la faible sélectivité en amines primaires, ainsi que la faible stabilité et la recyclabilité des catalyseurs. Pour résoudre ce prob
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43

Niu, Feng. "Development of novel catalysts for selective amination of alcohols." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R068.

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Les amines sont des intermédiaires très importants pour l’industrie chimique et la science de la vie, qui peuvent être synthétisés par différentes voies traditionnelles. L’amination catalytique d’alcools à base de métaux via le mécanisme dit “d'emprunt d'hydrogène” est un moyen relativement efficace et respectueux de l’environnement pour la synthèse de différentes amines primaires. Toutefois, certains problèmes subsistent, tels que le coût élevé des métaux nobles, la faible sélectivité en amines primaires, ainsi que la faible stabilité et la recyclabilité des catalyseurs. Pour résoudre ce prob
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44

Jean, Florian. "Elaboration et caractérisation de couches minces et d'objets nanométriques de pérovskite sans plomb Na0,5Bi0,5TiO3." Limoges, 2013. https://aurore.unilim.fr/theses/nxfile/default/db1bf760-c4fb-4369-87a9-39d5b07e7dbb/blobholder:0/2013LIMO4053.pdf.

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Ce travail est consacré à la synthèse et la caractérisation du matériau sans plomb Na0,5Bi0,5TiO3 (NBT) par différentes techniques, sous formes de films minces et de nano-objets supportés ou non. Dans un premier temps, des films minces de NBT ont été déposés par ablation laser pulsée sur différents substrats monocristallins de nature oxyde avec pour but l’obtention d’une croissance épitaxiale. L’effet de l’insertion d’une couche tampon de CeO2 sur la croissance des films a été étudié. Les propriétés électriques (ferroélectriques, diélectriques, agilité dans le domaine des micro-ondes) ont été
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45

Nader, Adel. "Supraconductivité des composés lamellaires incommensurables." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0013.

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Les composes lamellaires incommensurables sont construits par l'alternance d'une ou deux couches imxi et d'un, deux ou trois feuillets itx#2i ou m : pb, sn, bi, sb ou terre rare, t : nb, ta, ti, v et x : s ou se. La commensurablite entre les deux sous structures des deux types couches est parfaite selon les axes b et c, or selon l'axe a les parametres de maille ont un rapport qui s'approche de 3 d'ou le nom incommensurables. Certains de ces composes sont supraconducteurs avec des temperatures critiques entre 0,4 k et 5,5 k. Nous avons etudie le comportement du champ magnetique critique de ces
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46

Kundu, Animesh. "Hydrothermal synthesis of sodium bismuth titanate and titanate nanofibers." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3341187.

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47

Wang, Yi-Chi, and 王藝琦. "Bismuth Titanate Compound: Synthesis, Characterization and Photocatalytic Applications." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38177409062803661059.

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碩士<br>國立中興大學<br>化學工程學系所<br>104<br>The preparetion of photocatalyst Bismuth Titanate compound has been synthesized by the combination of direct hydrolysis method and hydrothermal treatment. The investigated parameters include molar ratio of Bi:Ti, hydrothermal temperature, and hydrothermal time. The photocatalytic reaction efficiency and the adsorption of dark box were used to determine the best conditions for the preparation of bismuth titanate photocatalyst. The structural information and morphology of the nanoparticles Bismuth Titanate compound were characterized by BET、XRD、TGA、FTIR、SEM/TEM
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48

Lu, Yen-Ting, and 呂燕婷. "Synthesis and electrical properties of sol-gel bismuth titanate." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/56306353725852980205.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>87<br>We have synthesized sol-gel bismuth titanate. Bismuth methoxyethoxide and titanium methoxyethoxide precursors were used. They were mixed by a molar ratio of 1.23:1 (Ti:Bi), and followed by a hydrolysis process ( [H2O]=1.135M, [H2O]/[M(OR)n]=1.305M ) to prepare bismuth titanium oxide powder. The Bi2Ti2O7 (B2T2) phase appeared when the powder was calcined at 550oC. That phase remained stable at 700oC/2hr. At the higher temperature, the B2T2 phase was transformed into Bi4Ti3O12 (B4T3) and Bi2Ti4O11(B2T4) phases. When the green body was sintered at 1
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49

Jackson, Dennis L. "An Ising-like model to predict dielectric properties of the relaxor ferroelectric solid solution BaTiO₃ − Bi(Zn₁/₂Ti₁/₂)O₃." Thesis, 2011. http://hdl.handle.net/1957/26334.

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We developed a model to investigate the dielectric properties of the BaTiO₃ − Bi(Zn₁/₂Ti₁/₂)O₃ (BT-BZT) solid solution, which is a relaxor ferroelectric and exhibits long range disorder. The model uses ab initio methods to determine all polarization states for every atomic configuration of 2 x 2 x 2 supercells of BT-BZT. Each supercell is placed on a lattice with an Ising-like interaction between neighboring cell polarizations. This method allows us to consider long range disorder, which is not possible with ab initio methods alone, and is required to properly understand relaxor ferroelectric
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50

Steiner, Sebastian. "Defect Chemistry of Sodium Bismuth Titanate and its Solid Solutions." Phd thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/11552/8/Defect%20Chemistry%20of%20Sodium%20Bismuth%20Titanate%20and%20its%20Solid%20Solutions_Thesis%20Sebastian%20Steiner.pdf.

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In this work, the perovskite structured system Na0.5Bi0.5TiO3 (NBT) and its solid solutions (1-x)(Na0.5Bi0.5TiO3)-xBaTiO3 (NBT-BT), (1-x)(Na0.5Bi0.5TiO3)-xSrTiO3 (NBT-ST) and [(1-x)(1-y)(Na0.5Bi0.5TiO3)-yBaTiO3)]-xCaZrO3 (NBT-BT-CZ) have been investigated. In detail, the impact of A-site non-stoichiometry and B-site doping on the electrical, dielectric, ferroelectric and piezoelectric properties was discussed. The main aim was to reveal the defect chemical origin of extremely high oxygen ionic conductivity in NBT and to apply the gained knowledge to control and enhance the properties of NBT-ba
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