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Raman scattering investigations of the antiferroelectric–ferroelectric phase transition of NaNbO 3
Author(s) -
Shen Z. X.,
Wang X. B.,
Kuok M. H.,
Tang S. H.
Publication year - 1998
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199805)29:5<379::aid-jrs249>3.0.co;2-f
Subject(s) - antiferroelectricity , ferroelectricity , raman spectroscopy , raman scattering , phase transition , condensed matter physics , materials science , hysteresis , polarization (electrochemistry) , chemistry , optics , optoelectronics , dielectric , physics
Abstract The antiferroelectric to ferroelectric phase transition in NaNbO 3 was investigated by Raman scattering between 295 and 10 K. The transition occurs at 185 K on cooling and the antiferroelectric and ferroelectric phases coexist at low temperature. The transition occurs at 210 K on heating and the relatively large hysteresis is attributed to the difficulty in reversing the spontaneous polarization direction at the transition. The results agree well with low‐temperature x‐ray data which show that both phases coexist if the crystal samples are twinned. The transition is not considered to be of the displacive type, although two modes at 115 and 121 cm ‐1 were observed to soften at low temperature. © 1998 John Wiley & Sons, Ltd.