Abstract
The UV photo induced effect in bismuth layered perovskite Pb2Bi4Ti5O18 has been investigated by a low frequency Raman scattering. The temperature dependences of Raman spectra both under and without a UV irradiation were observed around the ferroelectric to relaxor phase transition temperature. The central peak in the Raman spectrum shows narrowing under a UV irradiation below Tc. The correlation length of the ferroelectric fluctuation should be enhanced as a UV photo induced effect in the ferroelectric state.
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