Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/150166 |
Resumo: | Ceramics made of CaCu3Ti4O12 (CCTO) create great scientific interest after the discovery of its giant dielectric constant (κ), the high non-ohmic property and photolumenescence. In this study were prepared polycrystalline ceramics in the form of powder with the following composition: Ca1-xSrxCu3Ti4O12 (0.0 ≤ x ≤ 1.0), in which Ca2+ (site A) was gradually replaced by a cation Sr2+. The effects of this graduated replacement were analyzed in the structural and microstructure properties of polycrystalline powders. By the thermogravimetric analysis of the powders, produced by solid state reaction, determined the calcination temperature at 1223K. Analyzing the phases present in the material by the diffraction technique of X-rays its observed that the crystal structure formed is perovskite. When conducting semi-quantitative studies, by the scanning electron microscope with energy dispersive spectroscopy, it was obtained the morphology and chemical composition of the ceramics powders. By the techniques of spectroscopy (infrared, ultraviolet-visible absorption and photoluminescence) were obtained the values 548 cm-1, 500 cm-1 and 415 cm-1, for the vibrational modules of the bonding O-Ti-O, the band gap of 2,85 eV for the studied samples and the optical properties of the powder polycrystalline ceramics were determined. |
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Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12Synthesis and characterization of powder-ceramics of the Ca1-xSrxCu3Ti4O12 systemCaCu3Ti4O12 (CCTO)Propriedades estruturaisPropriedades ópticasStructural propertiesOptical propertiesCeramics made of CaCu3Ti4O12 (CCTO) create great scientific interest after the discovery of its giant dielectric constant (κ), the high non-ohmic property and photolumenescence. In this study were prepared polycrystalline ceramics in the form of powder with the following composition: Ca1-xSrxCu3Ti4O12 (0.0 ≤ x ≤ 1.0), in which Ca2+ (site A) was gradually replaced by a cation Sr2+. The effects of this graduated replacement were analyzed in the structural and microstructure properties of polycrystalline powders. By the thermogravimetric analysis of the powders, produced by solid state reaction, determined the calcination temperature at 1223K. Analyzing the phases present in the material by the diffraction technique of X-rays its observed that the crystal structure formed is perovskite. When conducting semi-quantitative studies, by the scanning electron microscope with energy dispersive spectroscopy, it was obtained the morphology and chemical composition of the ceramics powders. By the techniques of spectroscopy (infrared, ultraviolet-visible absorption and photoluminescence) were obtained the values 548 cm-1, 500 cm-1 and 415 cm-1, for the vibrational modules of the bonding O-Ti-O, the band gap of 2,85 eV for the studied samples and the optical properties of the powder polycrystalline ceramics were determined.Cerâmicas à base de CaCu3Ti4O12 (CCTO) com estrutura perovskita ABO3 geraram grande interesse científico devido à descoberta da constante dielétrica (κ) gigante, propriedade não ôhmica elevada e propriedade fotoluminescente. Neste trabalho foram preparadas cerâmicas policristalinas na forma de pó com a seguinte composição: Ca1-xSrxCu3Ti4O12 (0,0 ≤ x ≤ 1,0) na qual o Ca2+ (sitio A) foi gradativamente substituído pelo cátion Sr2+. Foram analisados os efeitos desta substituição gradativa nas propriedades estruturais e microestruturais dos pós policristalinos. Mediante técnicas de análise termogravimétrica dos pós, produzidos por reação do estado sólido, determinou a temperatura de calcinação a 950ºC. Analisando as fases presentes no material por meio da técnica de difratometria raios X observa-se que a estrutura cristalina formada é do tipo perovskita. Ao realizar os estudos semi-quantitativos, mediante microscopia eletrônica de varredura com detector de energia dispersiva, se obteve a morfologia e composição química dos pós cerâmicos. Por meio das técnicas de espectroscopia (de infravermelho, de absorção ultravioleta-visível e de fotoluminescência) foram obtidos os valores 548 cm-1, 500 cm-1 e 415 cm-1, para os módulos vibracionais das ligações O-Ti-O, o band gap de 2,85 eV para as amostras estudadas e determinou-se as propriedades ópticas da cerâmica policristalina na forma de pó.Universidade Estadual Paulista (Unesp)Angel Ramirez, Miguel [UNESP]Felix, Anderson André [UNESP]Universidade Estadual Paulista (Unesp)Saska Junior, Luiz Antonio [UNESP]2017-04-12T19:12:08Z2017-04-12T19:12:08Z2017-02-06info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/11449/15016600088393133004056083P7porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESP2023-10-14T06:09:54Zoai:repositorio.unesp.br:11449/150166Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:55:34.821752Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 Synthesis and characterization of powder-ceramics of the Ca1-xSrxCu3Ti4O12 system |
title |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
spellingShingle |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 Saska Junior, Luiz Antonio [UNESP] CaCu3Ti4O12 (CCTO) Propriedades estruturais Propriedades ópticas Structural properties Optical properties |
title_short |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
title_full |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
title_fullStr |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
title_full_unstemmed |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
title_sort |
Síntese e caracterização de pós-cerâmicos do sistema Ca1-xSrxCu3Ti4O12 |
author |
Saska Junior, Luiz Antonio [UNESP] |
author_facet |
Saska Junior, Luiz Antonio [UNESP] |
author_role |
author |
dc.contributor.none.fl_str_mv |
Angel Ramirez, Miguel [UNESP] Felix, Anderson André [UNESP] Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Saska Junior, Luiz Antonio [UNESP] |
dc.subject.por.fl_str_mv |
CaCu3Ti4O12 (CCTO) Propriedades estruturais Propriedades ópticas Structural properties Optical properties |
topic |
CaCu3Ti4O12 (CCTO) Propriedades estruturais Propriedades ópticas Structural properties Optical properties |
description |
Ceramics made of CaCu3Ti4O12 (CCTO) create great scientific interest after the discovery of its giant dielectric constant (κ), the high non-ohmic property and photolumenescence. In this study were prepared polycrystalline ceramics in the form of powder with the following composition: Ca1-xSrxCu3Ti4O12 (0.0 ≤ x ≤ 1.0), in which Ca2+ (site A) was gradually replaced by a cation Sr2+. The effects of this graduated replacement were analyzed in the structural and microstructure properties of polycrystalline powders. By the thermogravimetric analysis of the powders, produced by solid state reaction, determined the calcination temperature at 1223K. Analyzing the phases present in the material by the diffraction technique of X-rays its observed that the crystal structure formed is perovskite. When conducting semi-quantitative studies, by the scanning electron microscope with energy dispersive spectroscopy, it was obtained the morphology and chemical composition of the ceramics powders. By the techniques of spectroscopy (infrared, ultraviolet-visible absorption and photoluminescence) were obtained the values 548 cm-1, 500 cm-1 and 415 cm-1, for the vibrational modules of the bonding O-Ti-O, the band gap of 2,85 eV for the studied samples and the optical properties of the powder polycrystalline ceramics were determined. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-04-12T19:12:08Z 2017-04-12T19:12:08Z 2017-02-06 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/11449/150166 000883931 33004056083P7 |
url |
http://hdl.handle.net/11449/150166 |
identifier_str_mv |
000883931 33004056083P7 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
publisher.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808128437018165248 |