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Dissertations / Theses on the topic 'Bi2WO6'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Zhang, Ziyang. "Facile Synthesis of ZnWO4/Bi2WO6, FeWO4/Bi2WO6, and TiO2/Bi2WO6 Nanocomposites via a Modified Pechini Sol-gel Method and their Photocatalytic Performance for Bisphenol A Degradation." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613753216804191.

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2

Qin, Hanna. "Preparation, Characterization and Testing for Photocatalytic Activities of Bi2WO6-based Materials." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23583.

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PdCl2/Bi2WO6 and Pd/Bi2WO6 composite photocatalysts were synthesized via a template free hydrothermal process and the respective photocatalytic activities were investigated by degradation of Rhodamine B. The new catalyst composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet visible (UV-vis) light diffuse reflectance spectra, respectively. By XRD, it was found that the loaded Pd species did not alter the crystal lattice of Bi2WO6 photocatalyst. Through the XPS spectra, it was found that the PdCl2/Bi2W

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Hu, Xiaoyue. "Synthesis and Characterization of Graphene Oxide-modified Bi2WO6 and Its Use as Photocatalyst." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31459.

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The control of environmental pollution, particularly in wastewater treatment, is one of the major concerns of the 21st century. Among the currently available pollution control technologies, photocatalysis is one of the most promising and efficient approaches to the reduction of pollutants. Graphene, a carbon nanomaterial with specific physical and chemical properties, has been reported as a promising potential new catalyst material in this field. A Bi2WO6 photocatalyst modified with graphene oxide was synthesized in a two-step hydrothermal process. Compared with pure Bi2WO6, the modified photo

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4

Qiao, Yu. "Preparation, Characterization, and Evaluation of Photocatalytic Properties of a Novel NaNbO3/Bi2WO6 Heterostructure Photocatalyst for Water Treatment." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38080.

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Semiconductor-based heterogeneous photocatalysis, as one of the advanced oxidation processes that makes use of semiconductors and inexhaustible solar light, has recently been extensively studied and applied to water decontamination. However, due to low light absorption efficiencies and severe electron-hole recombination, modifications on semiconductor structures are required in order to enhance their photocatalytic performance. Heterogeneous photocatalyst composites, taking advantage of the improved light absorption efficiency as well as the facilitated electron-hole separation at the interfac

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5

Silva, Renata Martins da. "SÍNTESE DE MATERIAL PARTICULADO AMARELO A BASE DE TiO2 CONTENDO MoO3 E Bi2O3." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2013. http://tede2.uepg.br/jspui/handle/prefix/1431.

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Made available in DSpace on 2017-07-21T20:42:40Z (GMT). No. of bitstreams: 1 Renata Martins Silva.pdf: 2842741 bytes, checksum: 00c605c84616c33c3c08c2e35031efa1 (MD5) Previous issue date: 2013-02-22<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Was synthesized particulate material based on containing a small amount of bismuth compounds and molybdenum with satisfactory reproducibility. The material was produced starting from a composition of 99% (mol %) of rutile TiO2 and 1% of MoO3, which were previously mixed and calcined at 1200ºC. The composition studied consisted of 9

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6

Laurent, Kévin. "Etude expérimentale de la microstructure et des propriétés électriques et optiques de couches minces et de nanofils d'oxydes métalliques (d-Bi2O3 et ZnO) synthétisés par voie électrochimique." Phd thesis, Université Paris-Est, 2008. http://tel.archives-ouvertes.fr/tel-00470542.

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L'intérêt porté sur la miniaturisation des systèmes par la communauté scientifique est grand, que ce soit pour des raisons de mobilité, d'économie d'énergie ou d'innovation technologique. L'objectif de cette thèse est de déterminer les caractéristiques physiques et structurales des couches minces et des nanofils d'oxydes métalliques synthétisés par la méthode électrochimique. La première partie de cette thèse est consacrée à l'oxyde de bismuth en phase delta. Les couches minces élaborés par électrochimie sont de très bonne qualité cristalline, et seul la phase delta- Bi2O3 est présente. Le car

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MATOS, Lucyene Nascimento. "Estudo de fases cristalinas no sistema Bi2O3-Tb4O7." Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/821.

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Made available in DSpace on 2014-07-29T15:07:11Z (GMT). No. of bitstreams: 1 Dissertacao Lucyene Quimica.pdf: 715050 bytes, checksum: f0341d52acc4a9b488b447ca69a136f7 (MD5) Previous issue date: 2009-08-25<br>A systematic study concerning the crystalline phases in the Bi2O3-rich region of the system Bi2O3-Tb4O7 was made. X-ray powder diffraction method, differential thermal analysis (DTA) and differential scanning calorimetry (DSC) were used in the study of the obtained crystalline phases. Sixteen samples with composition in the range of 4.21 to 33.33 mol% of Tb4O7 were synthesized at 800oC b

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Silva, Fernanda Garcia e. [UNESP]. "Estudo do efeito de CdO e Bi2O3 no processo de nucleação e crescimento de cristais em matrizes vítreas [TeO2WO3] (CdO;Bi2O3)." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/91980.

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Made available in DSpace on 2014-06-11T19:25:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-18Bitstream added on 2014-06-13T19:32:45Z : No. of bitstreams: 1 silva_fg_me_ilha.pdf: 1536045 bytes, checksum: 5e52a7e90e9528b73306cfd4b593e9d3 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Apresentamos os resultados de estudos de cristalização de possíveis crescimentos de cristais semicondutores de óxido de telúrio (CdTe) e óxido de bismuto (Bi2O3) no sistema de vidro 20WO3-80TeO2 (TW). Estes trabalho configura-se como um estagio anterior aos estudos

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9

Silva, Fernanda Garcia e. "Estudo do efeito de CdO e Bi2O3 no processo de nucleação e crescimento de cristais em matrizes vítreas [TeO2WO3] (CdO;Bi2O3) /." Ilha Solteira, 2012. http://hdl.handle.net/11449/91980.

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Orientador: Keizo Yukimitu<br>Banca: Ezequiel Costa Siqueira<br>Banca: Américo Sheitiro Tabata<br>Resumo: Apresentamos os resultados de estudos de cristalização de possíveis crescimentos de cristais semicondutores de óxido de telúrio (CdTe) e óxido de bismuto (Bi2O3) no sistema de vidro 20WO3-80TeO2 (TW). Estes trabalho configura-se como um estagio anterior aos estudos de crescimentos de semicondutores em dimensões nanométricas(nanocristais "NCs") em vidros teluritos. Com este objetivo foi sintetizada a amostra: dopadas com óxido de cadmio e óxido de bismuto, em diversas proporções em suas com

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10

Moore, Katharine. "Preparation and characterisation of mixed CeO2-Nb2O5-Bi2O3 nanoparticles." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/252691.

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Mixed metal oxides are ionic compounds containing at least two metal ions within an oxide structure. The literature contains a plethora of examples of mixed metal oxides on the bulk scale, which have been well characterised, however, mixed metal oxides on the nanoscale are far less well understood. The work presented here investigates the Bi2O3-CeO2-Nb2O5 mixed oxide system and characterises the resulting nanoparticles and crystal structures. Although the parent oxides are well known and much work has previously been done in analysing their crystal structures, combinations of these oxides have

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11

Kotsantonis, Sotirios. "Oxygen transport in novel electrolyte materials based on Bi2O3." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529367.

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12

Oudich, Fayssal. "Contribution à l’étude thermodynamique du système Pb-Bi-(Hg)-Fe-(Al,Cr)-O : étude des systèmes Bi2O3–PbO–Al2O3 et Bi2O3–PbO–Fe2O3." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0273/document.

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Le présent travail de recherche s’inscrit dans un projet global, dont le but est de comprendre et résoudre un problème de corrosion d’un acier dit T91 par un mélange métallique liquide de plomb et bismuth. Il présente un intérêt pour la communauté nucléaire qui envisage de développer une nouvelle génération de réacteurs dits ADS. Ce travail est une contribution à l’étude thermodynamique d’un système plus complexe composé de plusieurs éléments : Al, Bi, Pb, Fe, Cr et l’oxygène. Plus précisément, il a été focalisé sur les systèmes à base de mélanges d’oxydes Bi2O3 + PbO + Al2O3 et Bi2O3 + PbO +

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13

Ren, Yuxuan. "Synthesis, Characterization and Testing of Bi2MoO6-Based Semiconductors Applied in Photocatalytic Water Treatment." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38901.

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Photocatalysis has received increasing attention in recent years as an effective technology in wastewater treatment applications. In this project, bismuth molybdate (Bi2MoO6), which is a popular visible-light-driven photocatalyst, was prepared by solvothermal and hydrothermal methods. The synthesis conditions, including thermal reaction temperature, synthesis duration, and precursor stirring time of the solvothermal method were optimized based on the photodegradation of Rhodamine B (RhB) under visible light irradiation. Furthermore, the CeO2/Bi2MoO6 composites with different CeO2 loading conte

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14

Bourja, Lamia. "Étude du système CeO2-Bi2O3 pour applications catalytiques et conductimétriques." Phd thesis, Toulon, 2011. http://tel.archives-ouvertes.fr/tel-00659119.

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Dans le cadre général des études de matériaux multifonctionnels, électrolytiques et catalytiques, susceptibles d'être utilisés au sein de dispositifs de détection de gaz, un système d'oxydes (1-x)CeO2. x/2Bi2O3 avec 0≤x≤1 a été élaboré par coprécipitation puis traitement thermique à 600°C. Le système ainsi obtenu correspondrait à un diagramme de phases original, constitué d'un domaine de solutions solides (Ce1-xBixO2-z pour x ≤ 0,20), d'un domaine multiphasé pour 0,3≤x≤0,7 comportant une phase de type quadratique b'-Bi2O3 et une phase cubique substituée limite (x=0,20), d'un autre domaine mult

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15

Bourja, Lamia. "Étude du système CeO2-Bi2O3 pour applications catalytiques et conductimétriques." Electronic Thesis or Diss., Toulon, 2011. http://www.theses.fr/2011TOUL0007.

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Dans le cadre général des études de matériaux multifonctionnels, électrolytiques et catalytiques, susceptibles d’être utilisés au sein de dispositifs de détection de gaz, un système d’oxydes (1-x)CeO2. x/2Bi2O3 avec 0≤x≤1 a été élaboré par coprécipitation puis traitement thermique à 600°C. Le système ainsi obtenu correspondrait à un diagramme de phases original, constitué d’un domaine de solutions solides (Ce1-xBixO2-z pour x ≤ 0,20), d’un domaine multiphasé pour 0,3≤x≤0,7 comportant une phase de type quadratique b’-Bi2O3 et une phase cubique substituée limite (x=0,20), d’un autre domaine mult

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16

Webster, Nathan A. S. "New fluorite-type Bi2O3-based solid electrolytes : characterisation, conductivity and crystallography." University of Western Australia. School of Biomedical and Chemical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0092.

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[Truncated abstract] New, double-doped, Bi2O3-based materials in the Bi2O3 Ln2O3 PbO (Ln = La, Nd, Er and Yb) and Bi2O3 WO3 PbO systems were prepared using solid-state reactions. For the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems, the air-quenchable compositional domain of the fcc fluorite-type phase was partially established. Temperature dependent conductivity measurements were performed on these quenched-in fluorite-type materials using AC impedance spectroscopy. Conductivity at 750[degrees Celsius] generally increased with increasing Pb2+/Ln3+ and decreasing (Ln3++Pb2+)/Bi3+ ratios

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17

Bégué, Pascale. "Matériaux originaux en relation avec Bi2MoO6 : nouvelles voies de synthèse, études structurales et propriétés électriques." Toulouse 3, 2001. http://www.theses.fr/2001TOU30017.

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18

FERREIRA, Katiúscia Daiane. "ESTUDO DE FASES E CRESCIMENTO DE MONOCRISTAIS NO SISTEMA Bi2O3 - TiO2 - ZrO2." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tde/1044.

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Made available in DSpace on 2014-07-29T15:12:45Z (GMT). No. of bitstreams: 1 dissertacaokatiusciaDaia.pdf: 861870 bytes, checksum: 844752d18d747dab701abe725ec66d0d (MD5) Previous issue date: 2008-08-18<br>I n this work a systematic study on the phase formation and stability in the system Bi2O3-ZrO2 was realized, the solubility of the Zr4+ ion in Bi12TiO20 (BTO) was investigated and Zr-doped BTO crystals (BTO:Zr) were grown and optically characterized. It was verified that a tetragonal phase was formed in the following wide composition interval: (6-x)Bi2O3:(1+x)ZrO2, with x = 0.5, 0.3, 0.2, 0

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Almeida, Patricia Matos Viana de. "Caracterização estrutural e dielétrica da matriz BaBi4Ti4O15(BBT) com adição de Bi2O3." Universidade Federal de Mato Grosso, 2015. http://ri.ufmt.br/handle/1/709.

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Durand, Olivier. "Propriétés structurales et vibrationnelles des phases désordonnées dans le système TeO2-Bi2O3." Limoges, 2006. http://aurore.unilim.fr/theses/nxfile/default/25dc7b11-f659-4f3e-93fb-e0700525f254/blobholder:0/2006LIMO0045.pdf.

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Ce travail visait à élucider la structure de composés métastables désordonnés mis en évidence dans la partie riche en TeO2 du système TeO2-Bi2O3. L’étude a été menée principalement par diffusion Raman, diffusion totale des neutrons et modélisation structurale par la méthode de Monte Carlo inverse. Ces phases possèdent des structures de symétrie moyenne cubique, constituées d’entités TeO4 et TeO3, enchaînées de sorte que les cations forment un réseau CFC bien défini jusqu’à des distances de quelques centaines de nm. Le réseau d’anions est presque totalement désordonné. L’analyse de la largeur d

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Sirota, Ben. "Synthesis and Characterization of ZnO and Bi2O3 Nanowires Grown by Magnetron Sputtering." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/766.

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Nanowires of Zinc oxide and bismuth oxide were grown on silicon substrates using vapor-liquid-solid (VLS) and unbalanced magnetron sputtering. Characterization using x-ray diffraction (XRD) and scanning electron microscopy (SEM) was conducted to investigate how growth conditions influence the structural and morphological properties of the materials. Optical properties were investigated using photoluminescence (PL), direct absorption spectra and cyclic voltammetry. The physical properties of sputtered ZnO were found to be dependent on oxygen flow rate, temperature, and the initial foreign metal

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22

Follet-Houttemane, Claudine. "Les phases oxyfluorées du système Bi2O3-PbO-PbF2 : stabilité - propriétés électriques - caractéristiques structurales." Lille 1, 1987. http://www.theses.fr/1987LIL10215.

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Mise en évidence de deux solutions solides ternaires : l'une de symétrie quadratique dans la partie riche en Bi2O3 du diagramme, l'autre de symétrie rhomboédrique possédant un domaine de stabilité plus étendu. Mesures de conductivité électrique effectuées par spectroscopie d'impédance : les valeurs atteintes par les matériaux de la phase quadratique sont toujours faibles, celles atteintes par ceux de la phase rhomboédrique dépendent fortement de la composition. Etudes structurales réalisées pour plusieurs compositions du domaine rhomboédrique par diffraction Rx sur monocristal et diffraction d

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Leandro, Silvana Castro. "Síntese e caracterização óptica de vidros da família TeO2 -B2O3 -(Bi2O3 ou WO3) /." Ilha Solteira, 2018. http://hdl.handle.net/11449/157392.

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Orientador: Keizo Yukimitu<br>Resumo: Vidros a base de óxidos de metais pesados (TeO2, WO3, Bi2O3) apresentam alto índice de refração, altos valores de não-linearidade óptica e alta constante dielétrica. Essas propriedades físicas possibilitam diversas aplicações, como, por exemplo, para comutação ultrarrápida em dispositivos ópticos e, exibem, quando dopados com terras raras, importantes propriedades de luminescência [1]. Vidros dos sistemas ternários xTeO2 – yB2O3 – zWO3 e xTeO2 – yB2O3 – kBi2O3 foram preparados pelo método “melt-quenching” com x de 70 a 45%mol, y de 40 a 10%mol, z de 30 a 1

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Helfen, Arnaud. "Elaboration et caractérisation d'un nouvel électrolyte solide pour les piles à combustible : δ-Bi2O3". Phd thesis, Université de Marne la Vallée, 2004. http://tel.archives-ouvertes.fr/tel-00351659.

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Dans le but de trouver un nouvel électrolyte pour les piles à combustible SOFC fonctionnant à basses températures, nous nous sommes intéressés au nouveau mode de synthèse électrochimique de la phase delta de l'oxyde de bismuth. d-Bi2O3 est connu comme le meilleur conducteur ionique, mais sa gamme de stabilité thermique réduite (729 ? 825°C) a freiné son utilisation. La méthode proposée par Switzer et al. permet de stabiliser cette phase à température ambiante. Cela relance l'intérêt d'étude pour ce matériau en vue d'une application comme électrolyte solide des piles à combustible. Nous avons t

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Labidi, Olfa. "RELATIONS STRUCTURES-PROPRIETES DANS LE SYSTEME Bi2O3-PbO-V2O5 : SURSTRUCTURES, POLYMORPHISME, INCOMMENSURABILITE et CONDUCTIVITE." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2006. http://tel.archives-ouvertes.fr/tel-00199221.

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Ce travail concerne la recherche de nouveaux matériaux à base de bismuth à propriétés spécifiques plus performantes, ou l'amélioration de propriétés de matériaux connus telles que la conduction ionique pour leur intérêt, en particulier dans le domaine énergétique. Dans le système Bi2O3-PbO-V2O5, notre travail a porté tout d'abord sur le domaine riche en bismuth. La structure du composé PbBi6V2O15 a été déterminée. Le problème de discernement par diffraction X de Bi3+ et de Pb2+ a été abordé par le remplacement du plomb par d'autres cations M2+ tels que Sr2+, Ca2+ et Cd2+. Les déterminations st

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Schmidt, Samara [UNESP]. "Estudo da modificação da fotoluminescência em α-Bi2O3 após tratamento térmico assistido por pressão". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136399.

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Schmidt, Samara. "Estudo da modificação na fotoluminescência em α-Bi2O3 após tratamento térmico assistido por pressão /". Araraquara, 2016. http://hdl.handle.net/11449/136399.

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Orientador: José Arana Varela<br>Co-orientador: Sergio Mazurek Tebcherani<br>Co-orientador: Diogo Pascoalini Volanti<br>Banca: Sonia Maria Zanetti<br>Banca: Marco Aurélio Cebim<br>Banca: Maximo Siu Li<br>Resumo: Este estudo avaliou o efeito de um tratamento tér mico assistido por pr essão sobre as propriedades de fotoluminescência do óxido de bismuto ( α - Bi 2 O 3 ) sintetizado pelo método hidrotérmi co assistido por micro - ondas (HAM ) . O α - Bi 2 O 3 teve sua estrutura determinada através da técnica de Difração de raios X, e com o auxílio de refinamentos pelo método de Rietveld foi possív

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Helfen, Arnaud. "Élaboration et caractérisation d'un nouvel électrolyte solide pour les piles à combustible : δ-Bi2O3". Marne-la-Vallée, 2004. https://tel.archives-ouvertes.fr/tel-00351659.

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Afin de trouver un nouvel électrolyte pour les piles à combustible SOFC fonctionnant à basses températures, nous nous sommes intéressés au nouveau mode de synthèse électrochimique de la phase delta de l’oxyde de bismuth. -Bi2O3 est connu comme le meilleur conducteur d'ion oxygène, mais sa gamme de stabilité thermique réduite (729 – 825°C) a freiné son utilisation. La méthode électrochimique permet de stabiliser cette phase à température ambiante. Nous avons tout d’abord étudié l’influence des paramètres de la synthèse de couches minces de δ-Bi2O3. Nous en avons déduit qu’une température de pl

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El, Harrak Amin. "Synthèse, stabilité et propriétés électriques de phases conductrices anioniques du système Bi2O3-CaO-PbO." Lille 1, 1990. http://www.theses.fr/1990LIL10106.

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L'étude du système Bi2O3-CaO-PbO par synthèse à l'état solide, diffraction X à température variable et analyse thermique différentielle a permis la caractérisation de quatre solutions solides. La solution solide de symétrie cubique, réseau F Delta dérive de la variété Delta de Bi2O3. Béta 1 et Béta 2, de symétrie rhomboédrique, réseau I, est caractéristique d'une structure de type anti-AgI Alfa. Seule Béta 2 est stable à température ambiante. Les variétés Béta 1 et Delta peuvent être préservées, sous forme métastable, par trempe à l'air dans des domaines de composition dont les limites ont été

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Laabidi, Olfa. "Relations structures-propriétés dans le système Bi2O3-PbO-V2O5 : surstructures, polymorphisme, incommensurabilité et conductivité." Lille 1, 2006. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2006/50376_2006_286.pdf.

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Ce travail concerne la recherche de nouveaux matériaux à base de bismuth à propriétés spécifiques plus performantes, ou l'amélioration de propriétés de matériaux connus telles que la conduction ionique pour son intérêt en particulier dans le domaine énergétique. Dans le système Bi2O3-PbO-V2O5, notre travail a porté tout d'abord sur le domaine riche en bismuth. La structure du composé PbBi6V2O15 a été déterminée. Le problème de discernement par diffraction X de Bi3+ et de Pb2+ a été abordé par le remplacement du plomb par d'autres cations M2+ tels que Sr2+, Ca2+ et Cd2+. Les déterminations stru

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Gong, Yuxuan. "Dielectric and Structural Study of Bi2O3-BaO-CuO Glass Flux Additives Sintered Barium Titanate for Multilayer Capacitor Applications." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368086374.

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Rocha, Marta Jussara Souza da. "Estudo das caracteristicas estruturais e elÃtricas do SrBi2Nb2O9 (SBN) dopado com La2O3, PbO e Bi2O3." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2611.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>CerÃmica Aurivillius sÃo conhecidas por sua excelente resistÃncia Ã fadiga e a sua alta temperatura de Curie, a qual apresenta cÃlula unitÃria ortorrÃmbica. A cerÃmica a ser estudada, SrBi2Nb2O9 (SBN), Ã matÃria-prima potencial na fabricaÃÃo de memÃrias ferroelÃtricas, com polarizaÃÃo espontÃnea e bons coeficientes piezelÃtricos. Dentro deste grupo cerÃmico, o SrBi2Nb2O9 (SBN) Ã o material com menor estrutura octaÃdrica distorcida. Apesar disto, o SBN sofre de perda dielÃtrica elevada, devido Ã evaporaÃÃo de Ãxido de bismuto du

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Arantes, Neto Moisés de Souza [UNESP]. "Estudo da cinética de nucleação e crescimento de cristais na matriz vítrea TeO2-WO3-Bi2O3." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143915.

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Submitted by MOISÉS DE SOUZA ARANTES NETO null (netomoises@yahoo.com.br) on 2016-09-17T18:56:55Z No. of bitstreams: 1 TESE_MOISES.pdf: 4715185 bytes, checksum: 9cf8bc8dfb49ce2c52b41de92483c1cf (MD5)<br>Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-09-21T16:55:10Z (GMT) No. of bitstreams: 1 arantesneto_ms_dr_ilha.pdf: 4715185 bytes, checksum: 9cf8bc8dfb49ce2c52b41de92483c1cf (MD5)<br>Made available in DSpace on 2016-09-21T16:55:10Z (GMT). No. of bitstreams: 1 arantesneto_ms_dr_ilha.pdf: 4715185 bytes, checksum: 9cf8bc8dfb49ce2c52b41de92483c1cf

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Arantes, Neto Moisés de Souza. "Estudo da cinética de nucleação e crescimento de cristais na matriz vítrea TeO2 – WO3 – Bi2O3." Ilha Solteira, 2016. http://hdl.handle.net/11449/143915.

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Orientador: Keizo Yukimitu<br>Resumo: O avanço tecnológico das últimas décadas proporcionou avanços significativos tanto na obtenção quanto nas aplicações dos vidros. Estes materiais possuem aspectos fundamentais, as quais os colocam como alternativas viáveis para aplicações na óptica, em espelhos primários de telescópios e até dispositivos fotônicos de fibras em escala nanométricas. Os vidros à base de óxido de telúrio são uma opção para substituir ou melhorar as características de sistemas vítreos convencionais como os vidros silicatos. As propriedades ópticas e estruturais dos vidros teluri

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Berkaïne, Nabil. "Propriétés optiques non-linéaires de composés métastables du système TeO2 - Bi2O3 : apports de la chimie quantique." Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/0553a07f-6261-48b5-a299-9696b78cdb0b/blobholder:0/2009LIMO4029.pdf.

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Ce travail porte sur l’étude des propriétés optiques non-linéaires des phases métastables orthorhombiques dans la partie riche en TeO2 du système TeO2 - Bi2O3. Après une étude structurale de ces phases, nous nous sommes intéressés à leurs propriétés optiques non-linéaires (ONL) du 2nd ordre en effectuant des mesures expérimentales de génération de seconde harmonique (GSH). Une variation surprenante de l’intensité de GSH de ces phases avec la composition a été observée. Afin d’en expliquer l’origine, la susceptibilité ONL de 2nd ordre de ces phases a été calculée en appliquant une méthode, préa

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Thompson, Maria. "Synthesis and characterisation of d-Bi2O3 related materials stabilised by substitutions of Ca, Ga, Nb and Re." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/1185/.

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The work reported in this thesis is based around substitutions into bismuth oxide, which has proven to be highly adaptable chemically as it can accommodate a wide variety of substituents. The synthesis and characterisation of stabilised δ-Bi₂O₃ related materials containing small amounts of Ca, Ga, Nb and Re are described. A body of work is presented exploring the structural and physical properties of such materials, characterised by neutron powder diffraction, X-ray powder diffraction, electron diffraction, extended X-ray absorption of fine structure measurements, differential thermal analysis

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Jacobsoone, Virginie. "Synthèse et caractérisation de phases oxyfluorées de type BIMEVOX et de verres oxyfluorés à base de Bi2O3." Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-15.pdf.

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L’étude du système Bi2O3-V2O5-ZnF2 a été pour la première fois réalisée en tubes d’or scellés. Par cette méthode de synthèse, une solution solide oxyfluorée a été mise en évidence au voisinage de Bi4V2O11. Les investigations structurales réalisées par diffraction des rayons X sur poudre et par affinement de Rietveld ont montré que les échantillons appartenant à ce domaine présentaient une structure proche de celle des phases BIMEVOX. Les ions fluorures sont localisés dans les feuillets de conduction de type pérovskite. Cependant, en raison de la faible proportion d’ions F- dans tous les échant

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Li, Rong. "Preparation and ion conductivity of nano to micron grains size Bi2O3-Ln2O3 (Ln=Dy, Y, Er) ceramics." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10141/document.

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L’objectif de ce travail était l’étude de l’effet de la taille des grains de céramiques à base d’oxyde de bismuth sur les propriétés de conduction ionique. Avec pour objectif la préparation de céramiques denses avec des grains de taille nanométrique, des poudres de composition (Bi2O3)0.75(Dy2O3)0.25, (Bi2O3)0.75(Er2O3)0.25, (Bi2O3)0.75(Y2O3)0.25 et (Bi2O3)0.75(Er2O3)0.125(Y2O3)0.125 ont été préparées avec succès par une méthode de dosage en retour. Des poudres avec des grains mono-cristallins d’environ 20 nm ont été obtenues, à partir desquelles, des céramiques denses ont ensuite été préparées

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LIU, CHUAN-YU, and 劉荃予. "Bi2WO6/Bi2O3 composites synthesis and the photocatalytic properties evaluation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/u8p6g7.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系博碩士班<br>104<br>This study synthesized bismuth tungstate (Bi2WO6) via the solvothermal method, ethylene glycol was used as the solvent, bismuth nitrate and sodium tungstate were the precursors. Moreover, this study employed the excess addition of bismuth nitrate to form Bi2O3 during the synthesis of Bi2WO6, the modified photocatalyst was Bi2O3/Bi2WO6. The mole of Bi2O3/Bi2WO6 at 0.05, 0.1, 0.25, 0.5 and 1 was denoted as 0.05BB, 0.1BB, 0.25BB, 0.5BB and 1BB, respectively. The photocatalytic activity of the Bi2O3/Bi2WO6 was determined by the photodegradation of C.I.

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HUANG, WAN-JING, and 黃菀淨. "Synthesis of SnO2 Modified Bi2WO6 and the Evaluation of Photocatalytic Activity." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/d66wv8.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系博碩士班<br>104<br>This study prepared Bi2WO6 via the solvothermal method and modified Bi2WO6 by tin oxide (SnO2) doping to from SnO2/Bi2WO6. The photocatalytic activity of Bi2WO6 and SnO2/Bi2WO6 was determined by the photodegradation of C.I. Reactive Red 2 (RR2) under a 400 W Xe lamp irradiation. The surface characteristics of prepared photocatalysts were determined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-v

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Hsu, Ming-Ju, and 許銘儒. "Synthesis of Nonmetal Modified Bi2WO6 and the Evaluation of Photocatalytic Activity." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/29898838371761964946.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系博碩士班<br>103<br>This study synthesized Bi2WO6 via the hydrothermal method. The effects of reaction solvent, pH value, heating temperature and time in hydrothermal method were evaluated. In order to enhance photocatalytic activity, Bi2WO6 was modified by boron (B) or carbon nanotube (CNT) doping. The photocatalytic activity of Bi2WO6 was determined by the photocatalytic degradation of C.I. Reactive Red 2 (RR2) under visible light (450 W Xe lamp) irradiation. The prepared photocatalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scan

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42

LAN, WANG-NING, and 藍婉寧. "Catalytic performance for methanol steam reforming over CuO/Bi2WO6 catalyst effect of oxygen vacancies." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/67844976532928637401.

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碩士<br>東吳大學<br>化學系<br>105<br>In this thesis, copper as an active center to prepare CuO/Bi2WO6 catalyst over steam reforming of methanol reaction (SRM) is used. Bi2WO6 is selected as a functional support based on its oxygen vacancy nature, these oxygen vacancies can provide oxygen atoms to yield reaction intermediates and further improve reaction activity. In this research, we use impregnation method to prepare two series of catalysts that denoted as m•CuO/Bi2WO6_8hr and m•CuO/Bi2WO6_20hr (m = 5, 10, 20, 30, 40 wt%, CuO weight %), respectively. The crystalline, surface area, morphology, redu

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WANG, CHIEN-WEI, and 王建緯. "Application of Ag-doped Bi2WO6/graphene and flower-like CuS/ZnS composite for photocatalytic H2 production." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3y6v9y.

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碩士<br>逢甲大學<br>化學工程學系<br>106<br>In the first part of this study, Ag doped Bi2WO6/graphene composite photocatalyst was prepared by solvothermal method. Ag-doped Bi2WO6-graphene based photocatalysts were found to exhibit hydrogen production activity. The performance of Bi2WO6-graphene based photocatalysts were investigated and optimized in this study. The activity can be further improved by Ag-doping. The morphology, surface chemistry, and phase structure of the photocatalysts were investigated by Field emission scanning electron microscopy, Transmission electron microscopy, X-ray photoelectron s

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I-TingChen and 陳俋廷. "High Pressure Photoreduction of CO2: g-C3N4/Bi2WO6/rGO prepared by a microwave-assisted-hydrothermal method." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/t7u47v.

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碩士<br>國立成功大學<br>環境工程學系<br>107<br>In recent years, the greenhouses gases (i.e., excessive CO2 emission) led to serious global climate change problems, e.g., greenhouse effect and extreme climate. Among various techniques for reduction of CO2 emissions, the photocatalytic conversion of CO2 into chemicals or fuels is considered one of the promising strategies to address this problem. Thus, it is important to explore a photocatalyst with stability, high efficiency, and low cost. In addition, considering most of the research about CO2 photoconversion was conducted at normal pressure, the effects of

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Wen-TingTang and 湯雯婷. "Microwave-assisted synthesis of g-C3N4/ Bi2WO6/ rGO for photocatalytic degradation of ibuprofen under visible light." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/mq43xf.

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Rout, Durga Prasad. "Synthesis, Characterization and Visible Light Driven Photocatalytic Applications of Bi2WO6 Nanoparticles Towards Congo Red Dye Degradation." Thesis, 2015. http://ethesis.nitrkl.ac.in/7889/1/2015_Synthesis_characterization___Rout.pdf.

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Bi2WO6 nanoparticles were synthesized using two novel methods namely amorphous citrate method and urea hydrolysis method. Phase pure Bi2WO6 was obtained in amorphous citrate method which have been ascribe to the homogeneous distribution of metal ions in the precursor due to the inherent ligating capacity of citric acid. The Bi2WO6 synthesized by urea hydrolysis method contain a mixed phase system with Bi2WO6 as major and Bi2W2O9 as minor phase. UV-visible spectral study indicated that the Bi2WO6 material exhibit significant visible light absorption suitable for photocatalytic applications. The

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Cheng, Meichun, and 鄭美君. "Synthesis and properties of nano Bi2WO6 photocatalysts and peroxymonosulfate advanced oxidation processes degradation with triphenylmethane dyes about efficiency and mechanisms." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77441204729821280150.

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碩士<br>國立臺中教育大學<br>科學應用與推廣學系科學教育碩士班<br>99<br>Two topics were discussed in this study, including homogeneous and heterogeneous reactions in the degradation of dyes. In the first part, the sulfate radical-based advanced oxidation technology was shown significant potential for environmental remediation to treat dye wastewater. The AOPs proceeded by Cobalt (Ⅱ) activation of peroxymonosulfate (PMS), i.e. Oxone for the Acid Blue 1 (AB1) dye, was studied in this work. It was observed that the degradation of AB1 in the Co2+/PMS system proceeded very fast and just required small amount of oxidant. It

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Chang, Yu-Hsueh, and 張鈺雪. "Stabilization of Bi2O3 High Temperature Phase." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/36340447212717411983.

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碩士<br>國立臺灣海洋大學<br>材料工程研究所<br>103<br>The stabilization of high temperature equilibrium δ-Bi2O3 phase to room temperature was carried out by high energy ball milling of Ta- or Ta2O5-doped α-Bi2O3 powder mixtures under environment with different oxygen level. The structures of the as-milled Bi2O3-based powder were examined by X-ray diffraction analysis, scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The experiments performed under 21% O2 atmospheric environment revealed that new crystalline phases formed inside as-milled 5 wt % Ta2O5-doped α-Bi2O3 powder at di

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49

Lee, Chin Tung, and 李勤東. "The influence of Bi2O3 content and melting temperature on the structure and properties of Bi2O3-ZnO- B2O3 glasses." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41738587942274493134.

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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>102<br>In this study,glasses with composition xBi2O3-(60-x)ZnO-40B2O3 (x=10, 20, 30 mol%) have been prepared at various melting temperatures (900℃, 1000℃, 1100℃, 1200℃) and followed by rapid quenching of melts.The effects ofBi2O3 content and melting temperature on the glass structure and properties are studied. The thermal properties of glass are investigated by differential thermal analysis (DTA) and thermal mechanical analyzer (TMA). The structures are probed by Fourier infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. Results sugg

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Saragih, Clara Sinta, and Clara Sinta Saragih. "Synthesis and Characterization of Bi@Bi2O3 Nanoparticles." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/pr5wv4.

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碩士<br>國立東華大學<br>物理學系<br>107<br>Bismuth (Bi) thin films and nanoparticles were synthesized using Pulsed Laser Deposition (PLD) technique. Bismuth thin films and nanoparticles were synthesized at various substrate temperature of 25, 50, 75, 100, 125, 150, 175, 200, 225 and 250 °C. The properties of bismuth thin films and nanoparticles were examined using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), X-ray Photoelectron spectroscopy (XPS), Raman spectroscopy and electrical properties (I-V) measurement. The thin films of Bi were

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