The divergent intensity of the central peak observed in Brillouin scattering spectra in potassium dihydrogen phosphate has been studied in the paraelectric phase and found to be VH polarized and to show "speckle" interference fringes. This implies that the scattering centers have time-independent amplitudes and positions. Photographs of the scattering column at different temperatures near the phase transition show that the scattering-center configuration is temperature independent.
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Durvasula et al. (1977) studied this question.
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