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Raman scattering was used to study the model relaxor ferroelectrics, PbMg1/3Nb2/3O3(PMN). In spite of a different stoichiometric ratio the Raman spectra of PMN are consistent with the Fm3m space symmetry PbSc1/2Ta1/2O3 (PST). This implies the existence of similar 1:1 ordered clusters in PMN at least in nanoscale regions. The disappearance of PMN Raman spectra at high temperature of about 900 K manifests the possibility of the dynamic change in the symmetry from Fm3m to Pm3m. A broad central peak appears in PMN in the temperature range preceding a ferroelectric state. These phenomena are considered as the dynamic features in course of evolution of the relaxors to a ferroelectric state
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Siny et al. (1999) studied this question.
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