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Raman scattering investigations of the low-temperature phase transition of NaNbO3

✍ Scribed by S. J. Lin; D. P. Chiang; Y. F. Chen; C. H. Peng; H. T. Liu; J. K. Mei; W. S. Tse; T.-R. Tsai; H.-P. Chiang

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
160 KB
Volume
37
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

In this work, we report the low‐temperature phase transition of sodium niobate (NaNbO~3~) ceramics at the antiferroelectric–ferroelectric phase studied by the Raman scattering technique over the temperature range 10–300 K. The spectral shape indicates that the phase transition occurs at 160 K on the cooling cycle and at 260 K on heating. The recorded spectra are discussed following the separation of modes into the internal stretching modes of the NbO~6~ octahedron and Na^+^ cation translational modes. The 62 and 75 cm^−1^ peaks are proposed as the translational modes of Na^+^ cation against the NbO~6~ octahedron. Copyright © 2006 John Wiley & Sons, Ltd.

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