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Dissertations / Theses on the topic 'TELLURIUM OXIDES'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Podchezertsev, Stanislav. "Magnetoelectric coupling in cobalt-based tellurium (VI) oxides with complex spin structures." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMC228.

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La thèse actuelle est consacrée à une étude complexe de diffusion de neutrons sur des séries de spinelles de tellure à base de cobalt (VI) dopées au zinc. Il a été constaté que le composé parent peut être obtenu sous deux formes structurelles: centrosymétrique désordonnée (groupe d'espace # 227) et non-centrosymétrique ordonnée (groupe d'espace # 212). Alors que le polymorphe désordonné soit un ferrimagnet typique de type Néel avec une transition magnétique à 40 K, le polymorphe ordonné possède deux transitions de phase magnétiques incommensurables à 45 K et 27 K. Grâce à l'approche de symétri

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2

Allen, Matthew David. "The oxidation and ammoxidation of propene using mixed oxides of iron, antimony and tellurium." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385111.

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3

Hullah, Daniel Fearnley. "The electronic spectra of FeH and TeOâ†2." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301915.

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4

DIAS, LUIS A. P. "Desenvolvimento de um metodo de producao de sup(131) I pela tecnica de destilacao a seco do oxido de telurio irradiado." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10944.

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Made available in DSpace on 2014-10-09T12:45:54Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:05:35Z (GMT). No. of bitstreams: 1 07312.pdf: 3603508 bytes, checksum: 963e59f9eb3fb8b6959c554770d86544 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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5

Rivero, Clara. "HIGH GAIN / BROADBAND OXIDE GLASSES FOR NEXT GENERATION RAMAN AMPLIFIERS." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3197.

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Interest in Raman amplification has undergone a revival due to the rapidly increasing bandwidth requirements for communications transmission, both for long haul and local area networks, and recent developments in the telecom fiber industry and diode laser technology. In contrast to rare earth doped fiber amplifiers, for which the range of wavelengths is fixed and limited, Raman gain bandwidths are larger and the operating wavelength is fixed only by the pump wavelength and the bandwidth of the Raman active medium. In this context, glasses are the material of choice for this application due to

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6

Zaki, Mohammed Reda. "Synthesis, structure and optical properties of new tellurium oxide-based glasses within the TeO₂-TiO₂-WO₃ and TeO₂-NbO₂̩ ̩₅-WO₃ systems." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0017/document.

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Ce travail est une contribution à la compréhension de la structure à courte et moyenne distance des verres à base de TeO₂ via de nouveaux verres au sein des systèmes TeO₂-TiO₂-WO₃ (TTxWy) et TeO₂-NbO₂ ̩₅-WO₃ (TNxWy). De pertinentes corrélations sont révélées entre leurs propriétés structurales (en utilisant la spectroscopie Raman) et optiques. Globalement, l’ajout de TiO₂, WO₃ ou NbO₂ ̩₅ n’engendre aucune évolution structurale brutale. L’ajout de TiO2 induit une séparation de phases entre les régions amorphes riches en TiO2 et le réseau riche en TeO2. Cette interprétation est en accord avec le

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7

Malik, M. S. "Comparative studies of the electronic properties of copper tellurite glasses containing nickel, cobalt and lutetium oxides and cupric chloride." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235019.

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8

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 n

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9

Yanamanagandla, Srikanth. "SYNTHESIS AND CHARACTERIZATION OF SCHOTTKY DIODES ON N-TYPE CdTe NANOWIRES EMBEDDED IN POROUS ALUMINA TEMPLATES." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/573.

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This work focuses on the growth of vertically aligned CdTe nanowire arrays of controllable diameter and length using cathodic electro deposition in anodized alumina templates. This step was followed by annealing at 250° C in a reducing environment (95% Ar + 5% H2). AAO template over ITO-glass was used as starting template for the device fabrication. The deposited nanowires showed nanocrystalline cubic phase structures with a strong preference in [111] direction. First gold (Au) was deposited into AAO using cathodic electro deposition. This was followed by CdTe deposition into the pore. Gold wa

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10

Türker, Muhammed [Verfasser], and Thomas [Akademischer Betreuer] Wichert. "Analyse zur Bildung atomarer Defektkomplexe nach Dotierung von Cadmium-Tellurid und Zink-Oxid / Muhammed Türker. Betreuer: Thomas Wichert." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2012. http://d-nb.info/1052551270/34.

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11

Quines, Caroline Brandão. "ESTUDO DA TOXICOLOGIA E DA FARMACOLOGIA DO 2-FENILETINILBUTIL-TELÚRIO EM ROEDORES." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/11223.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The organotellurium compounds have been the subject of research due to their pharmacological and toxicological properties. It is believed that the main mechanism involved in the toxicity of these compounds is the ability to interact with sulfhydryl groups from molecules biologically active. Beyond the toxicological effects, some pharmacological properties have been attributed to organotellurium compounds. This study aimed to investigate the potential toxicological and pharmacologic of 2-phenylethynyl-butyltellurium (PEBT) through e

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12

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 fenê

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13

Machado, Tamires Martinhão. "Estudo de vidros de teluritos contendo Sb2O3 para obtenção de nanopartículas de cobre com aplicação em fotônica." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/7175.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-06-15T11:35:12Z No. of bitstreams: 1 tamiresmartinhaomachado.pdf: 4666656 bytes, checksum: b71e71df107c39709c20a42e1c35c2c6 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-09-03T16:06:49Z (GMT) No. of bitstreams: 1 tamiresmartinhaomachado.pdf: 4666656 bytes, checksum: b71e71df107c39709c20a42e1c35c2c6 (MD5)<br>Made available in DSpace on 2018-09-03T16:06:49Z (GMT). No. of bitstreams: 1 tamiresmartinhaomachado.pdf: 4666656 bytes, checksum: b71e71df107c39709c20a42e1c35c2c6 (MD5) Previou

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14

Schumm, Benjamin. "Herstellung und Charakterisierung periodisch strukturierter Dünnschichten für den Einsatz in optoelektronischen Bauteilen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-119851.

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Transparente Elektroden finden breite Verwendung in unterschiedlichen kommerziellen Produkten. Dünnschichtsolarzellen basieren ebenso auf diesen Funktionsschichten wie Displays oder organische Leuchtdioden. Im Falle von Dünnschichtsolarzellen kann durch gezielte Einstellung der Oberflächentextur der transparenten Elektrode ein entscheidender Einfluss auf die erreichbare Effizienz genommen werden. Dabei wird eine Verlängerung der Weglänge des Lichtes im Absorbermaterial durch Mehrfachreflexionen angestrebt. Häufig werden dafür Schichten transparenter leitfähiger Oxide (TCO) gezielt texturiert.

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15

Lai, Chih-Hsuan, and 賴志軒. "Gas-Sensing Properties of Tungsten Oxide-Tellurium Heterogeneous Nanostructures." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27911066495613978248.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>104<br>Tunsteng oxide nanorods (WO3 Nrds) were synthesized through hydrothermal method which was reacted in solvent and was adjusted to pH2 , then heated at certain temperature for 24hr. and then tungsten oxide-tellurium (WO3-Te) heterogeneous nanostructure were grown on silicon (Si) substrate with WO3 nanorods covered, tungsten oxide-tellurium by which were synthesized through vapor transport (VS) method in a horizontal high-temperature tube furnace, with telluriun powder material. And Te nanosheet with radius from 100 to 300 nm were obtained on WO3 nanorods, th

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16

Chung, Hui Ting, and 鍾惠婷. "Structural Study of Vanadium Tellurium Barium Oxide Glasses by Raman Spectroscopy." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/18458676817152973332.

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碩士<br>輔仁大學<br>物理學系<br>95<br>V2O5-TeO2-BaO ternary oxide glasses (VTB glasses) are electrical conducting glasses. In the past, much of the work has been devoted to the study of the transport properties of the VTB glasses. On the contrary, less attention has been paid to the structural analysis. In this context, the main purpose of this work is to study the structural variation in connection with the composition of the ternary oxide glasses. Six V2O5-TeO2-BaO ternary oxide glasses were studied by Raman spectroscopy. The coordination of tellurium and vanadium has been deduced from the comparison

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17

Tu, Yao Tsung, and 凃耀宗. "Structural Study of Vanadium Tellurium Barium Oxide Glasses by Infrared Spectroscopy." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93911673213665025806.

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碩士<br>輔仁大學<br>物理學系<br>94<br>Vanadium-tellurium-barium oxide glasses (VTBOG) exhibit infrared cut-off frequencies in the midinfrared spectral range for short and long wavelengths near 6,000 cm-1 and 2,000 cm-1, respectively. Structure of the VTBOG in dependence of the composition was studied by infrared spectroscopy at room temperature. Experimental results deduced from the reflectance reveal that with the increase in the BaO content the five-coordinate VO5 structure transforms gradually into the four-coordinate VO4 structure, whilst the three-coordinate TeO3 structure remains nearly unchanged.

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18

Liu, Yan-Ting, and 劉彥廷. "Low-Temperature Gas Sensing Properties of Tellurium/ Zinc- Zinc Oxide Heterogeneous Nanostructure." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80736582364782327909.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>103<br>In this study, tellurium (Te) nanotubes, zinc-zinc oxide (Zn-ZnO) nanostructures and Te/Zn-ZnO heterogeneous nanostructures were grown on silicon (Si) substrate by two-stage vapor transport (VS) method in a horizontal high-temperature tube furnace. For the Te/Zn-ZnO heterostructure, the Zn-ZnO nanostructures were grown on Te nanotubes. Process conditions, including substrate temperature of the source and the deposition sides, gas flow rate and concentration, pressure in the quartz tube, hold temperature and time, were varied. Best process parameters were de

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19

Liu, Yen-Ling, and 劉妍伶. "Effects of Calcium Titanate and Strontium Titanate Additives on Microstructure and Microwave Dielectric Properties of Tellurium Oxide." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58994573466922782297.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>97<br>Recently, tellurium dioxide has been explored as a low-melting end member of dielectric ceramic compounds. Therefore, a number of tellurium-based low-temperature dielectric resonator materials with excellent dielectric constant and quality factor have been reported. However, most of these materials have a high τf and are not able to apply. This study is focus to compensate the negative temperature coefficient of TeO2 by adding of CaTiO3, SrTiO3 and investigate the effects on microstructure and dielectric properties. This study shows pure TeO2 ceramics wi

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20

Lin, Ching-Chun, and 林敬鈞. "Electrochromism and Resistive Switching Behaviors of Low Dimensional Oxide and Telluride Nanostructures." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/47757575352258937948.

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21

Hove, Miidzo. "Improvement of the V-1 characteristic of zinc oxide (ZnO) based metal oxide varistors (MOVs) using Silicon Telluride (SiTe2) and Lanthanum Hexaboride (LaB6) materials." Thesis, 2009. http://hdl.handle.net/10539/7047.

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A study to improve the V-I characteristic of the ZnO-based commercial MOV using a characterised chalcogenide material, Silicon Telluride (SiTe2), and a fieldemissive material, Lanthanum Hexaboride (LaB6), has been conducted. The need arises in that the current commercial ZnO-based metal oxide varistors (MOVs) have a V-I characteristic that departs substantially from that of the ideal one. As a result of this shortcoming, they do not offer ideal clamping action, and the consequence of this is that the protection they are supposed to offer is compromised. The problem behind this shortcomi

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22

Ahamad, M. Niyaz. "Multifunctionalities Of Telllurite And Borate Based Glasses Comprising Nano/Micro Crystals Of Tetragonal Tungsten Bronze-Type Ferroelectric Oxides." Thesis, 2009. http://hdl.handle.net/2005/1004.

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Transparent glasses embedded with TTB structured ferroelectric nano/micro crystals (K3Li2Nb5O15, Ba5Li2Ti2Nb8O30) were fabricated in various tellurite and borate based glass matrices and characterized for their physical properties. Nanocrystals of K3Li2Nb5O15 were successfully grown inside tellurite glass matrix via conventional heat-treatment route. Eventhough, tellurite glasses preferentially crystallize only on the surface, bulk uniform crystallization was achieved in the (100-x) TeO2 - x(1.5K2O-Li2O-2.5Nb2O5) system. Heat capacity studies revealed them to be thermodynamically less fragi

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23

Jagtap, Amardeep M. "Investigations on Photophysical Properties of Semiconductor Quantum Dots (CdxHg1-xTe,Ag2S) and their Interactions with Graphene Oxide, Organic Polymer Composites." Thesis, 2016. http://hdl.handle.net/2005/3069.

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The motivation of this thesis is to understand the physical properties of semiconductor quantum dots (QDs) and to get insight on the basic physics of charge separation in composites made from QDs with graphene oxide (GO)/organic semiconductors. The flexion phonon interactions is one of fundamental issues in solid state physics, which has a significant effect on both electrical and optical properties of solid state materials. This thesis investigates the physical properties of aqueous grown QDs through exciton-phonon coupling and non-radiative relaxation of excited carriers which have been carr

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