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

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorTeixeira, Nayara Gomes-
Autor(es): dc.creatorDias, Anderson-
Autor(es): dc.creatorMoreira, Roberto Luiz-
Data de aceite: dc.date.accessioned2025-08-21T15:03:55Z-
Data de disponibilização: dc.date.available2025-08-21T15:03:55Z-
Data de envio: dc.date.issued2012-07-02-
Data de envio: dc.date.issued2012-07-02-
Data de envio: dc.date.issued2007-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/927-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1001797-
Descrição: dc.descriptionThe 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Journal of the European Ceramic Society concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333160050143-
Palavras-chave: dc.subjectDielectric properties-
Palavras-chave: dc.subjectCapacitors-
Palavras-chave: dc.subjectSintering-
Palavras-chave: dc.subjectSpectroscopy-
Palavras-chave: dc.subjectPerovskites-
Título: dc.titleRaman scattering study of the high temperature phase transitions of NaTaO3.-
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