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Brillouin scattering spectra of K2, ZnBr4 have been observed near the first order. á-β transition point as a function of temperature. The frequenca shift in the β phase shows a different temperature dependence in each of experimental runs in contrast to a good reproducibility in the α phase. The present result seems to support the virtual intermediate states model proposed recently as a mechanism of the α-β transition.
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Takesada et al. (1994) studied this question.
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