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Dissertations / Theses on the topic 'Zirconium silicates'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Quevedo-Lopez, Manuel Angel. "Materials properties of hafnium and zirconium silicates: Metal interdiffusion and dopant penetration studies." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3221/.

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Hafnium and Zirconium based gate dielectrics are considered potential candidates to replace SiO2 or SiON as the gate dielectric in CMOS processing. Furthermore, the addition of nitrogen into this pseudo-binary alloy has been shown to improve their thermal stability, electrical properties, and reduce dopant penetration. Because CMOS processing requires high temperature anneals (up to 1050 °C), it is important to understand the diffusion properties of any metal associated with the gate dielectric in silicon at these temperatures. In addition, dopant penetration from the doped polysilicon gate in

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2

Valero, Rémi. "Mécanismes de la synthèse hydrothermale du zircon." Mulhouse, 1997. http://www.theses.fr/1997MULH0501.

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La synthèse hydrothermale du zircon a été principalement envisagée à partir d'un gel de zircone, élaboré à partir de l'oxychlorure de zirconium et d'une silice amorphe de type Aérosil 130 (Dégussa). La première partie du travail concerne l'étude du milieu de synthèse et en particulier l'étude de la solubilité des précurseurs en fonction du pH. A pH acide, les gels de zircone et de silice présentent des solubilités beaucoup plus importantes que le zircon, ce qui laisse entrevoir une possibilité de cristallisation. Toutefois, le gel de zircone étant deux fois plus soluble que la silice amorphe,

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3

Ben, Allal Laïla. "Préparation et caractérisation de silicates hydratés de lanthane, thorium, zirconium et aluminium en relation avec le problème de l'altération par l'eau de verres contenant ces éléments." Dijon, 1992. http://www.theses.fr/1992DIJOS020.

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Ce travail a permis de mettre en évidence l'influence de différents facteurs tels que le pH, le rapport molaire SiO2/K2O, le sens de mélange des réactifs sur la nature et la composition de silicates et polysilicates de différents éléments polyvalents. Ces éléments ont été choisis, dans le cadre d'un contrat avec le C. E. A. , pour leurs propriétés chimiques proches de celles de certains radionucléides : ce fut le cas pour le lanthane et le thorium ou en raison de leur présence dans la fritte, comme le zirconium et l'aluminium, lors de la fabrication des blocs de verres incluant ces éléments et

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4

Lomenech, Claire. "Etude mécanistique de l'interaction des ions uranyle avec l'oxyde et le silicate de zirconium." Paris 11, 2002. http://www.theses.fr/2002PA112098.

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Ce travail de thèse porte sur l'étude structurale et thermodynamique de l'adsorption des ions uranyle sur le silicate et l'oxyde de zirconium. La démarche adoptée a consiste à coupler à une approche macroscopique classique, une approche structurale microscopique de l'interface, permettant une définition expérimentale des équilibres de sorption, utilisée pour contraindre le code de calcul lors de la simulation des données thermodynamiques. Après la caractérisation de la surface des matériaux, l'étude thermodynamique a été réalisée pour différentes concentrations initiales des ions uranyle, diff

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5

MATSUI, JEFERSON M. "Estudo de degradação a baixa temperatura de cerâmicas Y-TZP/Al2O3 sintetizadas por coprecipitação." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28024.

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Submitted by Pedro Silva Filho (pfsilva@ipen.br) on 2017-11-17T17:43:50Z No. of bitstreams: 0<br>Made available in DSpace on 2017-11-17T17:43:50Z (GMT). No. of bitstreams: 0<br>A zircônia tetragonal estabilizada por ítria (Y-TZP) têm sido utilizada na área odontológica para próteses livres de metais devido à estética associada ao alto desempenho mecânico. Porém, a presença de ambiente úmido pode causar a transformação acelerada da fase tetragonal para monoclínica e consequente falha catastrófica deste material, processo este conhecido como degradação a baixa temperatura ou envelhecimento. A c

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6

Riquieri, Hilton. "Impacto do processo de cristalização na microestrutura e na resistência à flexão de cerâmicas de silicato de lítio reforçadas por zircônia." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152526.

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Submitted by HILTON RIQUIERI null (hilton.riquieri@terra.com.br) on 2018-01-11T19:29:07Z No. of bitstreams: 1 Tese Impressão 11-01-18.pdf: 5465220 bytes, checksum: 6c44956d0ac81de9008cdd4833458455 (MD5)<br>Approved for entry into archive by Silvana Alvarez null (silvana@ict.unesp.br) on 2018-01-18T15:27:03Z (GMT) No. of bitstreams: 1 riquieri_h_dr_sjc.pdf: 5445301 bytes, checksum: bf194667a00b4990a467e32526c3cdb9 (MD5)<br>Made available in DSpace on 2018-01-18T15:27:03Z (GMT). No. of bitstreams: 1 riquieri_h_dr_sjc.pdf: 5445301 bytes, checksum: bf194667a00b4990a467e32526c3cdb9 (MD5) Pre

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7

Ramos, Aline. "Nucleation et croissance cristallines dans un verre sio::(2)-al::(2)o::(3)-li::(2)o : etude par microscopie electronique a haute resolution et absorption des rayons x." Paris 6, 1988. http://www.theses.fr/1988PA066504.

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Etude des premieres etapes de la cristallisation dans un verre du systeme sio::(2)-al::(2)o::(3)-li::(2)o(mgo) dans lequel de faibles quantites de titane et de zirconium sont introduites comme elements nucleants

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8

Silva, Edegar Ozorio da. "Estudo das propriedades de troca ionica de silicofosfato de zirconio (IV)." [s.n.], 1988. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249714.

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Orientador : Yoshitaka Gushiken<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-16T15:52:26Z (GMT). No. of bitstreams: 1 Silva_EdegarOzorioda_M.pdf: 2818487 bytes, checksum: 77f58701b3a1d20b2dba75df7e5995b8 (MD5) Previous issue date: 1988<br>Mestrado

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9

McBride, Sean Patrick. "Using Perturbed Angular Correlation Spectroscopy to Characterize the Dependencies of Phase Transitions on Impurity Levels in Synthetic Hafnium Silicate and Synthetic Zirconium Silicate." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1121872817.

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10

Rambo, Matthew P. "Study of ZrSiO4 phase transition using perturbed angular correlation spectroscopy." Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1109871239.

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Thesis (M.S.)--Miami University, Dept. of Physics, 2005.<br>Title from first page of PDF document. Document formatted into pages; contains [1], vii, 55 p. : ill. Includes bibliographical references (p. 53-55).

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11

Ramos, Nathália de Carvalho. "Efeito de infiltrações de sílica pelo método sol-gel em uma zircônia odontológica : microestrutura, propriedades mecânicas, resistência de união e energia interfacial para fratura /." São José dos Campos, 2018. http://hdl.handle.net/11449/154979.

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Orientador: Renata Marques de Melo Marinho<br>Coorientador: Tiago Moreira Bastos Campos<br>Banca: Altair Antoninha Del Bel Cury<br>Banca: Marco Antonio Bottino<br>Banca: Paulo Francisco César<br>Banca: Guilherme de Siqueira Ferreira Anzaloni Saavedra<br>Resumo: O objetivo do estudo foi avaliar os efeitos de diferentes infiltrações de sílica pelo método sol-gel realizado com a presença de catalisadores nas propriedades mecânicas, microestrutura, características de superfície de uma zircônia Y-TZP, e na resistência de união entre a zircônia e um cimento resinoso, bem como avaliar a energia inter

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12

Pelletant, Aurelien. "Elaboration de matériaux composites céramiques à faible coefficient de dilatation thermique pour des applications spatiales." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0018.

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Actuellement, la qualité de l’imagerie provenant de systèmes optiques spatiaux est limitée par la taille de leurs miroirs et la masse des structures supportant le miroir. Le développement de systèmes athermiques légers (un seul matériau) constitue le principal challenge dans l’amélioration de ces systèmes. De matériaux légers, résistants mécaniquement (E/ρ3 > 10, σf > 100 MPa) et stables thermiquement (< 2,0.e-6/K) doivent être développés. Dans ce cadre, notre travail porte sur l’élaboration de composites céramiques associant un matériau à coefficient de dilatation thermique (CTE) pos

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13

Kashkari, Afnan. "Comparison of Load-to-Fracture Values and Fracture Characterization of Monolithic Zirconia, Lithium Disilicate, and Zirconia-Reinforced Lithium Silicate Glass-Ceramic CAD/CAM Crowns." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469039766.

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14

Rambo, Matthew P. "Study of ZrSiO₄ Phase Transition Using Perturbed Angular Correlation Spectroscopy." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1109871239.

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15

Pineda, Santos Alicia. "Estudio del tratamiento de un agua con alto contenido en silicatos de zirconio mediante Microfiltración y Ultrafiltración." Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/2601.

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En la presente Tesis Doctoral se ha estudiado la viabilidad del tratamiento de un agua residual con alto contenido de silicatos de zirconio, procedente de una industria de procesado de sólidos, mediante la combinación de los procesos de Microfiltración y Ultrafiltración, con la finalidad de generar un agua con las características adecuadas para ser reutilizada dentro del proceso industrial cerámico. Dentro del proceso industrial se genera un agua residual con un aspecto opaco debido a la presencia de silicato de zirconio, además de contener residuos de polielectrolito que es empleado en la s

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16

Hidalgo, Garcia Javier. "Development of binder systems based on CAB for powder injection moulding (PIM) and micro powder injection moulding (µ-PIM) of Zircon and Invar powders." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2043/document.

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Les contributions de cette thèse de doctorat sont focalisées sur les développements de formulations à base de polymères bio sourcés et déliantable à l’eau basés sur l’emploi d’acétate butyrate de cellulose (CAB) et de polyéthylène glycol (PEG). Ces nouvelles formulations ont été appliquées sur différentes nuances de poudres métalliques (invar) et céramiques (zircones). Ces matériaux possèdent une bonne stabilité dimensionnelle sous une large gamme de température imposée et possèdent de très bas coefficients d’expansion thermique.L’objective est l’étude et la compréhension du comportement des l

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17

Oliveira, Antonio Pedro Novaes de. "Efeito da fração volumetrica e do tamanho de particula na porosidade e no comportamento ao desgaste abrasivo de uma frita transparente reforçada com silicato de zirconio." reponame:Repositório Institucional da UFSC, 1993. https://repositorio.ufsc.br/xmlui/handle/123456789/157784.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnologico<br>Made available in DSpace on 2016-01-08T18:03:31Z (GMT). No. of bitstreams: 1 95662.pdf: 5185706 bytes, checksum: 7219abc1902dbd81404b18998e157638 (MD5) Previous issue date: 1993<br>Testes de abrasão empregando as técnicas de avaliação visual-PEI, rugosidade e reflexão da luz, foram realizados com o propósito de investigar os efeitos do tamanho e da fração volumétrica de uma fase de reforço, na porosidade e no mecanismo de desgaste abrasivo de vidrados cerâmicos. Com esta finalidade utilizou-se o conceito d

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18

hung, chien chi, and 簡吉鴻. "Silica、Zirconia and Zirconium Silicate Thin Films Prepared by Magnetron Sputtering." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/85817605148903407982.

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碩士<br>國立東華大學<br>材料科學與工程研究所<br>89<br>The developments of future gate oxide of MOS device for ULSI technology and next-generation capacitor of DRAM devices for memory storage require new dielectric materials. There is significant interest in using ZrO2 for the fabrication of charge storage insulators in the next generation memories. In this study, thin films of zirconia, silica, and zirconium silicate were deposited on Si(100) and glass substrates by R.F. magnetron sputtering from zirconia, silica and zirconium silicate composite ceramic targets instead of metal targets. This research

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19

Brasseale, Beau J. (Beau John) 1980. "An In-Vitro Comparison of Microleakage With E. faecalis In Teeth With Root-End Fillings of Proroot MTA and Brasseler's EndoSequence Root Repair Putty." Thesis, 2011. http://hdl.handle.net/1805/2707.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Brasseler USA (Savannah, GA) developed and introduced a bioceramic putty called EndoSequence Root Repair Material (ERRM) that can be used as a retrofilling material for surgical endodontics. The material is said to have many of the same chemical, physical, and biological properties as mineral trioxide aggregate (MTA), but with superior handling characteristics. The material is composed of calcium silicates, monobasic calcium phosphate, zirconium oxide, tantalum oxide, proprietary fillers, and thickening agents. ERRM is said by the m

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20

Rayner, Gilbert Bruce. "Spectroscopic investigation of local bonding in zirconium silicate high-k dielectric alloys for advanced microelectronic applications." 2002. http://www.lib.ncsu.edu/theses/available/etd-11072002-142855/unrestricted/etd.pdf.

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21

Chen, Hung-Wei, and 陳宏瑋. "A study of the growth and characterization of ultra-thin advanced gate dielectrics: oxynitride, zirconium oxide and its silicate." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/27362711860624134365.

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博士<br>國立交通大學<br>電子工程系<br>91<br>In this dissertation, we have investigated the feasibility of ultra-thin advanced gate dielectrics for nanometer CMOS devices. The advanced gate dielectrics include oxynitride, ZrO2 and Zr silicate. The deposition techniques for oxynitride, ZrO2 and Zr silicate are ECRCVD and MOCVD, respectively. The physical characteristics of these advanced gate dielectrics are studied by XPS, AFM, MEIS, HRTEM. The effects of post deposition anneal are also explored, and promising electrical characteristics are demonstrated. First, we propose a methodology to analyze

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22

Peretich, Michael Edward. "Targeted Synthesis and Characterization of Nanostructured Silicate Building Block Supports and Heterogeneous Catalysts with Tungsten(VI) or Zirconium(IV) Centers." 2011. http://trace.tennessee.edu/utk_graddiss/1215.

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Catalysts play a vital role in almost every aspect of our lives and are used in the production of fuels, polymers, chemicals, foods, and pharmaceuticals. One challenge facing the heterogeneous catalysis community is the targeted synthesis of dispersed catalyst ensembles. The Barnes research group has developed a general methodology for the synthesis of nanostructured silicate building block supports and heterogeneous catalysts. This methodology provides researchers with the ability to control the dispersion of surface functionality, the dispersion of metal cation centers, the number of linka

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23

Abdulwahed, Abdulaziz. "The effect of repetitive firing cycles on physical and optical properties of zirconia reinforced lithium silicate ceramics." Thesis, 2019. https://hdl.handle.net/2144/37991.

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This study’s objective was to evaluate repetitive firing cycles’ effects on the translucency, light’s absorption coefficient, and flexural strength of zirconia-reinforced lithium silicate ceramics. Two zirconia-reinforced lithium silicate ceramics and one lithium disilicate glass-ceramic were tested. Blocks of all materials were sectioned into tiles with different thicknesses and subjected to up to five firing cycles using the firing schedule indicated in the manufacturer’s user instructions. Light transmission ratio (T) and absorption coefficients were determined using a spectrophotometer. F

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24

Chen, Yung-lu, and 陳永錄. "Corrosion behavior and properties of silicate and zirconia composite coatings on AZ91D magnesium alloy using micro-arc discharge oxidation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/29983425743123390119.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>102<br>In this study, the characteristics of the oxide film coated on magnesium alloy AZ91D are discussed using silicate-based and zirconate-based electrolyte system. The microstructure, phase composition, oxide hardness and corrosion resistance of the MDO coatings were discussed by adjusting duty ratio and working time under constant frequency (500 Hz) and working voltage(400 V/-50 V). In the silicate-based electrolyte system, the higher duty ratio results in the high working current. Besides, the working current is proportional to the oxide growth rate. When the du

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