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Dissertations / Theses on the topic 'Zinc aluminate'

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Published: 4 June 2021

Last updated: 17 February 2022

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1

SANTOS, Patrícia Tatiana Araújo dos. "Novos materiais híbridos a base de ZnAl2O4 dopados com európio." Universidade Federal de Campina Grande, 2011. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1802.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-09-25T15:07:35Z No. of bitstreams: 1 PATRÍCIA TATIANA ARAÚJO DOS SANTOS - TESE (PPGEP) 2011.pdf: 1900230 bytes, checksum: 89561c399b083520a1b499f7b2a0e152 (MD5)<br>Made available in DSpace on 2018-09-25T15:07:35Z (GMT). No. of bitstreams: 1 PATRÍCIA TATIANA ARAÚJO DOS SANTOS - TESE (PPGEP) 2011.pdf: 1900230 bytes, checksum: 89561c399b083520a1b499f7b2a0e152 (MD5) Previous issue date: 2011<br>Capes<br>Nanopartículas de ZnAl1,9Eu0,1O4 foram modificadas a superfície usando agentes amino-silanos, e funcionalizadas a partir de monômero

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FURTADO, Cristiane Miranda. "Efeito da funcionalização com quitosana e glutaraldeído para obtenção de materiais híbridos a partir do ZnAl1,95(Yb:Er)0,05O4, visando aplicações biotecnológicas." Universidade Federal de Campina Grande, 2013. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1901.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-10-05T11:15:00Z No. of bitstreams: 1 CRISTIANE MIRANDA FURTADO - TESE (PPGEP) 2013.pdf: 8542186 bytes, checksum: dd770c02b3fb0777b254739165ed99da (MD5)<br>Made available in DSpace on 2018-10-05T11:15:00Z (GMT). No. of bitstreams: 1 CRISTIANE MIRANDA FURTADO - TESE (PPGEP) 2013.pdf: 8542186 bytes, checksum: dd770c02b3fb0777b254739165ed99da (MD5) Previous issue date: 2013-07-11<br>CNPq<br>A utilização de nanopartículas inorgânicas contendo propriedades luminescentes (NPLs) tem recebido uma atenção especial devido a sua utilização p

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Stringhini, Fabiane Marconato. "SÍNTESE DE ALUMINATO DE ZINCO (ZnAl2O4) PELO MÉTODO DE COMPLEXAÇÃO METAL-QUITOSANA E SEU USO COMO FOTOCATALISADOR." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/7975.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In this work, the synthesis of the oxide zinc aluminate spinel (ZnAl2O4) was realized by the metal-chitosan complexation method in different calcinations temperatures with the purpose of studying their influence in the physical properties of the material. The powders obtained were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), nitrogen adsorption-dessorption by the Brunauer-Emmett-Teller (BET) method, scanning electron microscopy (SEM) and differential thermal analysis (DTA). This material was used as catal

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4

Huang, Sui-Yang. "Elaboration et caractérisation de nouveaux matériaux ferriélectriques ou pyroélectriques de type BaAl2O4." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1993. http://tel.archives-ouvertes.fr/tel-00136415.

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De nouveaux matériaux à base de BaAl2O4 et BaZnGeO4 ont été caractérisés. BaAl2O4 et les phases dérivées sont ferriélectriques: la polarisation spontanée possède deux composantes de sens opposes et d'intensités différentes. Un modèle a été propose pour justifier l'apparition d' une phase non stoechiométrique dérivée de BaAl2O4.BaZnGeO4 est pyroélectrique a 300K; cinq transitions de phase ont été mises en évidence. Les céramiques de BaZnGeO4 se polarisent spontanément au cours du traitement thermique en raison du caractère piezoélectrique du matériau.

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5

Mrad, Mary. "La production d'hydrogène via la valorisation de la biomasse par reformage catalytique du méthanol." Thesis, Littoral, 2011. http://www.theses.fr/2011DUNK0409.

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Dans le but d'étudier la production d'hydrogène via la réaction de vaporeformage catalytique du méthanol et de déterminer les différents paramètres influençant la réaction, la performance des catalyseurs Cu-Zn/CeO₂-Al₂O₃ a été évaluée. L'imprégnation du cuivre sur la cérine ou l'alumine, montre de meilleurs performances catalytiques que le zinc imprégné sur ces mêmes supports. En présence de la cérine, l'activité a été liée à la dispersion des espèces Cu²⁺ isolés en interaction avec la matrice, qui se réduisent dans la phase de prétraitement du catalyseur. En présence de l'alumine, des espèces

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6

Breteau, Jean-Marc. "Etude de materiaux dopes ni**(2+) et co**(2+) pour laser accordable a fonctionnement continu dans le proche infrarouge." Paris 6, 1986. http://www.theses.fr/1986PA066357.

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Les composes mgf::(2): ni, mgf::(2): co, kznf::(3): ni, kznf::(3): co et mga1::(2)o::(4): ni font l'objet d'une etude spectroscopique pour determiner leurs caracteristiques en tant que materiaux pour laser accordable a fonctionnement continu dans le proche i. R. (1 mu m a 2 mu m). Nous montrons le role de la concentration en ions actifs sur l'intensite et la duree de vie de fluorescence i. R. Ainsi que l'importance des transferts d'energie et de la reabsorption dans l'etat excite. Pour l'ensemble des materiaux, les transitions radiatives et non radiatives font l'objet d'une etude approfondie q

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7

Clavijo, William. "Nanowire Zinc Oxide MOSFET Pressure Sensor." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/625.

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Fabrication and characterization of a new kind of pressure sensor using self-assembly Zinc Oxide (ZnO) nanowires on top of the gate of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is presented. Self-assembly ZnO nanowires were fabricated with a diameter of 80 nm and 800 nm height (80:8 aspect ratio) on top of the gate of the MOSFET. The sensor showed a 110% response in the drain current due to pressure, even with the expected piezoresistive response of the silicon device removed from the measurement. The pressure sensor was fabricated through low temperature bottom up ultrahig

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8

Burgess, Claire Hannah. "Atomic layer deposition of alumina and zinc oxide for optoelectronic devices." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/58239.

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Atomic layer deposition (ALD) uses surface reactions of gaseous precursors to grow thin films of materials. Exceptional uniformity and thickness control is possible due to the separation of the different precursors, allowing each to undergo reactions with substrate surface groups until, on chemisorption of a complete monolayer, self-termination occurs. Purging after the precursor release removes by-products and remaining precursor, ensuring that the material growth proceeds layer-by-layer. These and other benefits such as relatively low deposition temperatures, and the ability to coat large ar

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Alves, Camila Almeida. "Efeito da adição de ZnO em catalisadores Ni-Al2O3, Ni-CeO2, Ni-MgO e Ni-ZrO2 para reação de reforma seca de metano." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-09122014-110701/.

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Devido a crescente preocupação com relação ao efeito estufa e com o objetivo de obter produtos de maior valor agregado a partir dos gases CH4 e CO2, este trabalho estudou catalisadores de níquel suportados em diferentes óxidos (Al2O3, CeO2, MgO e ZrO2) promovidos com ZnO aplicados na reação de reforma seca de metano para obter gás de síntese (H2 + CO). Primeiramente foram estudados catalisadores de níquel suportados em ZrO2 dopados com diferentes teores de zinco: 0%, 5%, 12,5% e 25% a fim de selecionar o catalisador mais promissor para estudos posteriores. Também foram utilizados dois métodos

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Flura, Aurélien. "Réduction sélective catalytique des NOx par des composés oxygènes." Poitiers, 2011. http://nuxeo.edel.univ-poitiers.fr/nuxeo/site/esupversions/e54ad33f-a463-4cb3-bb36-07c5b01f48c3.

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Les moteurs Diesels connaissent un intérêt récent tout particulier car ils rejettent moins de CO2 que les moteurs essences à puissance égale, du fait qu'ils travaillent en "mélange pauvre", i. E. En excès d'oxygène. Ils présentent cependant l'inconvénient de former des NOx (NO et NO2), qui sont des polluants difficilement réductibles en azote en milieu oxydant. L'objectif de cette thèse est de proposer un catalyseur actif en réduction des NOx par l'éthanol (EtOH-SCR) à 200°C, qui est la température moyenne d'un échappement de moteur Diesel. Afin de répondre à cette problématique, un catalyseur

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11

Silva, Yankel Bruno Fontes. "Estudo da zirc?nia refor?ado com alumina." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12685.

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Made available in DSpace on 2014-12-17T14:06:53Z (GMT). No. of bitstreams: 1 YankelBFC.pdf: 3745387 bytes, checksum: 0a72ac9538c533fa074f31beeeb3660d (MD5) Previous issue date: 2008-12-29<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Ceramics materials have good properties including chemical stability, high hardness and wear resistance. Moreover, due to its fragility, can suffer failure under relatively low levels of tension. Actually zirconia is the material of choice in metal free dental prostheses used in dentistry due its inertia in physiological environment, good b

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12

Moustaghfir, Abdellah. "Elaboration et caractérisation de couches d'oxyde de zinc." Clermont-Ferrand 2, 2004. https://tel.archives-ouvertes.fr/tel-00012168.

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Cette thèse a pour objet l'élaboration et l'étude des propriétés de revêtements d'oxyde de zinc en vue de protéger le polycarbonate (PC) contre la photodégradation. Ces revêtements ont été déposés par pulvérisation cathodique r. F. Dans un plasma Ar-O2. La phase plasma été caractérisée par spectroscopie d'émission optique. Les couches de ZnO ont été soumises à des traitements thermiques qui ont modifié leur composition, leurs propriétés structurales et optiques et leurs contraintes internes. L'adhésion du revêtement sur le PC dépend des conditions de dépôt. Elle a été améliorée en appliquant a

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13

Cavallotti, Rémi. "Effets de la terminaison de l’α-alumine sur le comportement au mouillage du zinc". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066409/document.

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Le procédé de galvanisation à chaud se compose d’un recuit continu suivi d’une immersion de la bande d’acier dans un bain de zinc afin de lui conférer une protection contre la corrosion. Au cours de l’étape de recuit de recristallisation des nouveaux aciers, dits à « haute limite élastique », les éléments d’addition, tel que l’aluminium, ségrégent et diffusent en surface où ils forment des îlots voire des films superficiels qui, mal mouillés par le zinc liquide, nuisent à la qualité du produit final. Dans ce cadre, l’étude s’est attachée d’une part à caractériser l’oxydation sélective d’alliag

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14

Zymelka, Daniel. "Suivi par methode optique du frittage micro-ondes d'oxydes ceramiques." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00821161.

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Le frittage micro-ondes est connu pour être une technique de frittage prometteuse. En effet, ce procédé présente comme avantages une réduction de la durée des traitements thermiques et un gain énergétique important par rapport aux procédés conventionnels. D'année en année, le frittage dans un environnement micro-ondes est étudié par un nombre croissant de chercheurs. Cependant, les raisons de l'effet bénéfique de ce type de frittage ne sont pas clairement identifiées.Dans ce contexte, l'objectif de ce travail a été de vérifier l'influence d'un champ électromagnétique à la fréquence de 2,45 GHz

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15

Ferhat-Hamida, Zohra. "Caractérisation des catalyseurs cuivre-zinc par thermodésorption d'hydrogène et thermoréaction." Poitiers, 1987. http://www.theses.fr/1987POIT2011.

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LUCENA, Marcella Auxiliadora de Melo. "Síntese, Caracterização e Avaliação do Sistema ZnAl2O4:TR3+ como Marcador Luminescente para Resíduo de Tiro." Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/10171.

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Submitted by João Arthur Martins (joao.arthur@ufpe.br) on 2015-03-03T18:16:33Z No. of bitstreams: 2 Dissertação Marcella Auxiliadora de Melo Lucena.pdf: 6289742 bytes, checksum: f7c92de0e29465f2aff09175a7482db4 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)<br>Made available in DSpace on 2015-03-03T18:16:33Z (GMT). No. of bitstreams: 2 Dissertação Marcella Auxiliadora de Melo Lucena.pdf: 6289742 bytes, checksum: f7c92de0e29465f2aff09175a7482db4 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2012<br>C

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Silva, Cl?udia Angl?lica Melo da. "Estruturas cer?micas a base de zirc?nia e alumina utilizadas na confec??o de infra - estruturas para coroas e pontes fixas." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12689.

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Made available in DSpace on 2014-12-17T14:06:54Z (GMT). No. of bitstreams: 1 ClaudiaAMS_DISSERT.pdf: 2577371 bytes, checksum: 741bbb91aaccd5dd4b233f1b8017a831 (MD5) Previous issue date: 2010-03-29<br>The continuous advances in ceramic systems for crowns and bridges infrastructure getting researchers and manufacturers looking for a material that has good mechanical properties and aesthetic. The purpose of this study was to verify in which composition and sintering temperature the ceramic system for infrastructure composed of alumina and zirconia would have the best mechanical properties. With

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Ramirez, Daniel. "Electrodeposición de nanohilos y redes macroporosas de oxido de cinc a partir de diversos precursores de oxígeno." Paris 6, 2008. http://www.theses.fr/2008PA066701.

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Alves, Carine Tondo. "Transesterificação de Óleos e Gorduras Residuais via rotas metílica e etílica utilizando o catalisador Aluminato de Zinco, em presença ou não de CO2 supercrítico." Universidade Federal da Bahia, 2012. http://repositorio.ufba.br/ri/handle/ri/23902.

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Submitted by infopei ufba (infopei@ufba.br) on 2017-08-07T18:35:09Z No. of bitstreams: 1 TESE-CARINE_TONDO_ALVES.pdf: 4198906 bytes, checksum: e7a6045dd5e751079523ef43e8a9eb69 (MD5)<br>Approved for entry into archive by Vanessa Reis (vanessa.jamile@ufba.br) on 2017-08-09T15:32:31Z (GMT) No. of bitstreams: 1 TESE-CARINE_TONDO_ALVES.pdf: 4198906 bytes, checksum: e7a6045dd5e751079523ef43e8a9eb69 (MD5)<br>Made available in DSpace on 2017-08-09T15:32:31Z (GMT). No. of bitstreams: 1 TESE-CARINE_TONDO_ALVES.pdf: 4198906 bytes, checksum: e7a6045dd5e751079523ef43e8a9eb69 (MD5)<br>Neste estudo, o alumin

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Souza, Fernando Barcelos Marcolino de. "Caracteriza??o de cer?micas porosas de alumina refor?ada com zirc?nia produzidas pelo m?todo da r?plica." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15562.

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Made available in DSpace on 2014-12-17T14:57:49Z (GMT). No. of bitstreams: 1 FernandoBMS.pdf: 3386932 bytes, checksum: 168cdc99a75d4f1724f61a337a6c9569 (MD5) Previous issue date: 2008-09-29<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Porous ceramics have many applications: thermal insulation, catalytic support, materials to fire protection, filters, and others. There are many techniques to production of ceramic filters. One technique to obtain ceramic filters is the replication method. This method consists in the impregnation of polymeric foam with ceramic slurry follow

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Heuguet, Romain. "Développement des procédés micro-ondes monomodes à 2450 MHz et 915 MHz pour le frittage de céramiques oxydes." Caen, 2014. http://www.theses.fr/2014CAEN2028.

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Le travail rapporté dans cette thèse est consacré au développement de nouvelles cavités résonantes pour les dispositifs micro-ondes monomodes, dans le but de traiter des matériaux à hautes températures. Le travail de conception mené a permis de mettre en œuvre un dispositif permettant de réaliser des traitements thermiques à des températures supérieures à 1500°C. Les nouveaux dispositifs micro-ondes monomodes ont ainsi été exploités pour le frittage de différentes céramiques oxydes. L’apport de ce nouvel applicateur a, par exemple, été démontré au travers du frittage de l’oxyde de zinc. L’étud

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Moison, Hélène. "Activation anionique par l'alumine, le fluorure de potassium depose sur alumine, l'oxyde de magnesium et l'oxyde de zinc : application aux reactions de wittig, wittig-horner et knoevenagel." Rennes 1, 1987. http://www.theses.fr/1987REN10001.

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23

Costa, Hermes de Souza. "Fabricação de biocerâmicas de matriz porosa com estrutura em alumina, recobrimento superficial de fosfato de cálcio e zinco incorporado à superfície." Universidade Federal de Minas Gerais, 2006. http://hdl.handle.net/1843/BUOS-8DHE2F.

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There is an increasing demand for synthetic bone replacement materials, resulting from the limited supply of autograft materials and increased health risks associated with the use of allografts. A suitable scaffold material exhibiting adequate mechanical and biological properties is required to enable tissue regeneration. The processing technique used for fabrication of macroporous ceramics involved the preparation of ethanolic slurry from mixture of Al2O3 powder, dispersing agents and binder. Alumina porous bodies were fabricated by the polymer foam replication process, where polyurethane foa

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Van, Zandt Nicholas L. "Aqueous Fabrication of Pristine and Oxide Coated ZnSe Nanoparticles." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1623356039586297.

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Hannour, Khadija. "Étude de flux de brasage pour l'aluminium à base de cryolithes et de chlorures alcalins : propriétés thermiques et réactivité." Compiègne, 1993. http://www.theses.fr/1993COMPD612.

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Ce travail concerne la synthèse, la caractérisation, les propriétés thermiques et la mise en œuvre des flux de brasage de l'aluminium couramment utilisés en industrie automobile pour l'assemblage des pièces constituant un radiateur de voiture. Une étude des réactions chimiques se développant dans les différentes étapes du procédé de brasage a été menée. Les flux utilisés contiennent des chlorures de lithium, sodium et potassium mélangés à une cryolithe au sodium ou au potassium. Le rôle d'un additif ZnC12 a été également examiné. La première partie porte sur les propriétés thermiques des flux.

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Moreira, Micheline Dami?o Dias. "Rotas de s?nteses qu?micas para obten??o de nanopart?culas de Ag/Y-Al2O3 e Ag/ZnO com propriedades bactericidas." PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/23497.

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Toussaint, Patrick. "Contribution à l'étude de la formation de la couche d'inhibition de l'acier galvanisé en continu." Doctoral thesis, Universite Libre de Bruxelles, 1997. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212205.

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<p align="justify">Un simulateur de laboratoire de galvanisation continue a été conçu et utilisé pour l'étude des effets des paramètres de contrôle du procédé sur la prise d'aluminium interfacial avec un intérêt particulier porté té à la simulation de l'hydrodynamique de l'écoulement du liquide à la surface de la tôle ainsi qu'aux durées d'immersion extrêmement courtes inférieures à une seconde. Les effets de la concentration en aluminium et des températures de travail ont aussi été étudiés. Il a pu être montré que la prise d'aluminium est extrêmement rapide dans les premiers instants de la ré

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Lin, Yi-Hsun, and 林逸勛. "The Study on The Luminescent Characteristics of Zinc Aluminate Phosphors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65b6q5.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>99<br>In this study, ZnAl2O4 (gahnite) phosphors were synthesized by the sol-gel method. The effects of host material, activator amount and heat-treatment on the crystallinity, microstructure and luminescence were investigated. Changing the structure of host material and the various doping level of activators could produce transparent gels. Phosphor gels were obtained after heat treatments. Structural analysis showed that varying the activator’s amount had no significant influence on the crystallinity. However, the crystallinity of ZnAl2O4 was decreased with

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Tsai, Kai-min, and 蔡凱閔. "The Study on the Preparation and Characterization of Zinc Aluminate Phosphors." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/hekzm7.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>102<br>In this study, ZnAl2O4:Ti phosphors were synthesized by the sol-gel method. The effects of activator and heat-treatment condition on the structure, microstructure and luminescence were investigated. The ZnAl2O4:Ti phosphors started to crystallize into zinc spinel phase after heating at 300oC. After heating at 300~1200oC, the phosphors had normal spinel structure with nanocrystalline and nanostructures. The prepared powders had mesopores micro structure after heating at 1000-1200oC. The activator had most Ti ions in the form of Ti4+ and was well-di

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Chen, Yu-Xiang, and 陳鈺翔. "The Study on the Preparation and Characterization of Zinc Aluminate Powders." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/92rh47.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>97<br>In this study, zinc aluminate phosphor were synthesized by the sol-gel process. The effects of activator amounts and heat-treatments on the structure, crystallinity , microstructure and photoluminescent properties were investigated. Metal salts and metal alkoxides were used as precursors with various activator amounts. Transparent sols could be obtained by controlling the proper concentrations of acidic electrolyte. The activator amount could influence the gelation time remarkably. The as-prepared gel powders began to form ZnAl2O4 structure after heati

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Shih-Yen, Chen. "Luminescent and Structural Analysis of Nanosized Strontium Aluminate and Zinc Sulfide Phosphors." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1107200612395800.

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Chen, Shih-Yen, and 陳師彥. "Luminescent and Structural Analysis of Nanosized Strontium Aluminate and Zinc Sulfide Phosphors." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20728037643505594775.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>94<br>In the first part of this thesis, synthesis of Eu2+, Dy3+ -activated strontium aluminate nanosized phosphors via a novel reverse microemulsion process is reported. This new synthesis technique not only reduced the synthesis temperature of SrAl2O4:Eu2+, Dy3+ phosphors to as low as 900oC, but also reduced the phosphor particle size to nanometer scale. In the microemulsion process, nanometered-micellees trapped the constituent cations, leading to a reduction of the interdiffusion length and an enhancement of the reactivity of the precursors. The photoluminescence

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Pan, Bo-Yu, and 潘柏宇. "The Study on the Preparation and Optical Properties of Zinc Aluminate phosphor Gels." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/92r5f6.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>96<br>In this study, zinc aluminate phosphor gels were synthesized by the sol-gel process. The effects of various precursors, solution concentrations, heat-treatments and dopant amounts on the structure, crystallinity, microstructure and photoluminescent properties were investigated. Metal salts and metal organic compounds were used as precursors and various dopants as well as doping amounts were added. The gels showed cloudy for metal salt precursors, while transparent sols and gels could be obtained by controlling the proper concentrations of water and aci

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Chen, Yu Shiang, and 陳昱翔. "Studies on the Effect of Structural Modification and Hydrolysis on the Characterization of Zinc Aluminate Oxide." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/75u6ap.

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碩士<br>國立虎尾科技大學<br>材料科學與綠色能源工程研究所<br>102<br>In this study, ZnAl2O4:Mn phosphors were synthesized by the sol-gel method. The effects of structural modification of host , hydrolysis and doping activator on the structure, microstructure and luminescence were investigated. Manganese-doped ZnAl2O4 phosphor started to crystallize into ZnAl2O4 phase after heating at 300oC and homogeneous ZnAl2O4 were obtained after heating at 1200oC and the structure was normal spinel. In addition, differerce hydrolysis processes could affect the grain size of the phosphor. The addition of urea which could decrease t

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Tsai, Tsung-Ju, and 蔡宗儒. "The properties of Tm3+orTm3+/Er3+ codoped zinc alumina phosphates glass." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/33511384397795856193.

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碩士<br>國立聯合大學<br>材料科學工程學系碩士班<br>94<br>The objective of thesis is study the structure and properties of ternary alumina zinc phosphate glasses with doped rare-earth oxides. It is shows that the glass soften temperature (Td) below 700℃, the glass transition temperature (Tg) below 600℃ and the thermal expansion coefficient (α) of 7.5~4.4×10-7/℃(100-200℃). The minimum dissolution rate (H2O 30℃ 3days, wt% loss) is up to 5.0×10-9 g/cm2•min, it is successfully to break through the choke point that phosphate glass had weak chemical stability. It also shows that the glass properties has highly relatio

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"Proton-conducting beta"-alumina via microwave-assisted synthesis and mechanism of enhanced corrosion prevention of a zinc rich coating with electronic control." PRINCETON UNIVERSITY, 2008. http://pqdtopen.proquest.com/#viewpdf?dispub=3308035.

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