Raman scattering study of the high temperature phase transitions of NaTaO3.

Detalhes bibliográficos
Autor(a) principal: Teixeira, Nayara Gomes
Data de Publicação: 2007
Outros Autores: Dias, Anderson, Moreira, Roberto Luiz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/927
Resumo: The phase transition sequence of sodium tantalate (NaTaO3) ceramic samples has been investigated by Raman spectroscopy, from room temperature up to 640 ◦C. At room temperature, NaTaO3 shows an orthorhombically distorted perovskite structure belonging to the Pbnm space group. Raman and infrared vibrational spectra at 20 ◦C are in relative good agreement with group theory predictions for this group. At high temperatures, NaTaO3 shows three phase transitions, in the sequence Pbnm (∼450 ◦C) Cmcm (∼560 ◦C) P4/mbm (∼620 ◦C) Pm¯3m. The Raman spectra for the two intermediate high temperature phases showed a decreasing of the number of the active modes, accompanied by band broadening, and were well compatible with structural symmetry increasing at higher temperatures.
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spelling Teixeira, Nayara GomesDias, AndersonMoreira, Roberto Luiz2012-07-02T18:51:17Z2012-07-02T18:51:17Z2007TEIXEIRA, N. G.; DIAS, A.; MOREIRA, R. L. Raman scattering study of the high temperature phase transitions of NaTaO3. Journal of the European Ceramic Society, v. 27, n.13-15, p.3683–3686, mar. 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0955221907000581>. Acesso em: 02 jul. 2012.09552219http://www.repositorio.ufop.br/handle/123456789/927The phase transition sequence of sodium tantalate (NaTaO3) ceramic samples has been investigated by Raman spectroscopy, from room temperature up to 640 ◦C. At room temperature, NaTaO3 shows an orthorhombically distorted perovskite structure belonging to the Pbnm space group. Raman and infrared vibrational spectra at 20 ◦C are in relative good agreement with group theory predictions for this group. At high temperatures, NaTaO3 shows three phase transitions, in the sequence Pbnm (∼450 ◦C) Cmcm (∼560 ◦C) P4/mbm (∼620 ◦C) Pm¯3m. The Raman spectra for the two intermediate high temperature phases showed a decreasing of the number of the active modes, accompanied by band broadening, and were well compatible with structural symmetry increasing at higher temperatures.Dielectric propertiesCapacitorsSinteringSpectroscopyPerovskitesRaman scattering study of the high temperature phase transitions of NaTaO3.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleO Periódico Journal of the European Ceramic Society concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333160050143info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://www.repositorio.ufop.br/bitstream/123456789/927/5/license.txt8a4605be74aa9ea9d79846c1fba20a33MD55ORIGINALARTIGO_RamanScatteringStudy.pdfARTIGO_RamanScatteringStudy.pdfapplication/pdf220663http://www.repositorio.ufop.br/bitstream/123456789/927/1/ARTIGO_RamanScatteringStudy.pdff8100e3998bb6711e6172ba44b0c54d5MD51123456789/9272019-02-25 09:23:26.979oai:localhost: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Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-02-25T14:23:26Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.pt_BR.fl_str_mv Raman scattering study of the high temperature phase transitions of NaTaO3.
title Raman scattering study of the high temperature phase transitions of NaTaO3.
spellingShingle Raman scattering study of the high temperature phase transitions of NaTaO3.
Teixeira, Nayara Gomes
Dielectric properties
Capacitors
Sintering
Spectroscopy
Perovskites
title_short Raman scattering study of the high temperature phase transitions of NaTaO3.
title_full Raman scattering study of the high temperature phase transitions of NaTaO3.
title_fullStr Raman scattering study of the high temperature phase transitions of NaTaO3.
title_full_unstemmed Raman scattering study of the high temperature phase transitions of NaTaO3.
title_sort Raman scattering study of the high temperature phase transitions of NaTaO3.
author Teixeira, Nayara Gomes
author_facet Teixeira, Nayara Gomes
Dias, Anderson
Moreira, Roberto Luiz
author_role author
author2 Dias, Anderson
Moreira, Roberto Luiz
author2_role author
author
dc.contributor.author.fl_str_mv Teixeira, Nayara Gomes
Dias, Anderson
Moreira, Roberto Luiz
dc.subject.por.fl_str_mv Dielectric properties
Capacitors
Sintering
Spectroscopy
Perovskites
topic Dielectric properties
Capacitors
Sintering
Spectroscopy
Perovskites
description The phase transition sequence of sodium tantalate (NaTaO3) ceramic samples has been investigated by Raman spectroscopy, from room temperature up to 640 ◦C. At room temperature, NaTaO3 shows an orthorhombically distorted perovskite structure belonging to the Pbnm space group. Raman and infrared vibrational spectra at 20 ◦C are in relative good agreement with group theory predictions for this group. At high temperatures, NaTaO3 shows three phase transitions, in the sequence Pbnm (∼450 ◦C) Cmcm (∼560 ◦C) P4/mbm (∼620 ◦C) Pm¯3m. The Raman spectra for the two intermediate high temperature phases showed a decreasing of the number of the active modes, accompanied by band broadening, and were well compatible with structural symmetry increasing at higher temperatures.
publishDate 2007
dc.date.issued.fl_str_mv 2007
dc.date.accessioned.fl_str_mv 2012-07-02T18:51:17Z
dc.date.available.fl_str_mv 2012-07-02T18:51:17Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.citation.fl_str_mv TEIXEIRA, N. G.; DIAS, A.; MOREIRA, R. L. Raman scattering study of the high temperature phase transitions of NaTaO3. Journal of the European Ceramic Society, v. 27, n.13-15, p.3683–3686, mar. 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0955221907000581>. Acesso em: 02 jul. 2012.
dc.identifier.uri.fl_str_mv http://www.repositorio.ufop.br/handle/123456789/927
dc.identifier.issn.none.fl_str_mv 09552219
identifier_str_mv TEIXEIRA, N. G.; DIAS, A.; MOREIRA, R. L. Raman scattering study of the high temperature phase transitions of NaTaO3. Journal of the European Ceramic Society, v. 27, n.13-15, p.3683–3686, mar. 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0955221907000581>. Acesso em: 02 jul. 2012.
09552219
url http://www.repositorio.ufop.br/handle/123456789/927
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reponame_str Repositório Institucional da UFOP
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