Abstract
The Raman and Brillouin scattering experiments have been performed in bismuth layered ferroelectric oxide SrBi2Ta2O9 (SBT) using a double monochromator and Sandercock-type tandem Fabry-Perot interferometer on a six pass stage, in order to clarify the existence of the phase transition at T* = 850 K in addition to the conformation of ferroelectric one at T c . The clear anomaly of the phase transition was observed at T* = 850 K in the temperature dependence of the transverse acoustic c44 mode but not in the longitudinal c33 one. It is concluded that the intermediate phase exists in SBT between the ferroelectric phase and the highest temperature one.
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