Abstract
The precursor dynamics of relaxor ferroelectrics are studied by Brillouin and Raman scattering. Above TC, Raman scattering spectra reflect the existence of polar nanoregions (PNRs) by broken local symmetry in a cubic matrix. The polarization fluctuations in dynamic PNRs induce elastic anomaly and an intense broad central peak below Burns temperature TB. The average size of dynamic PNRs was estimated as a function of temperature assuming the local piezoelectricity in PNRs owing to the lack of the center of symmetry. The marked growth of the size towards TC was found in a cubic paraelectric phase. In normal ferroelctric KTN, BaTiO3 also show the precursor dynamics related to dynamic PNRs.
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