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Título : Raman scattering study of the high temperature phase transitions of NaTaO3.
Autor : Teixeira, Nayara Gomes
Dias, Anderson
Moreira, Roberto Luiz
Palabras clave : Dielectric properties
Capacitors
Sintering
Spectroscopy
Perovskites
Fecha de publicación : 2007
Citación : 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.
Resumen : 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.
URI : http://www.repositorio.ufop.br/handle/123456789/927
ISSN : 09552219
metadata.dc.rights.license: O Periódico Journal of the European Ceramic Society concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333160050143
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