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Raman scattering from mixed ordered and disordered crystals with perovskite structure has been investigated. In the paraelectric phase of the ordered crystal first-order lines were observed with symmetry properties forbidden for an ideal perovskite structure. Also, Raman line in the high frequency region is attributed to local mode associated with charge inequivalency of ions at B positions.
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Smolensky et al. (1976) studied this question.
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