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Longitudinal and quazilongitudinal phonons relative velocity variations are analyzed as functions of temperature and frequency in Rb3H(SeO4)2. Evaluated sound velocity dispersion is attributed to the growth of ionic conductivity. Probable dispersion mechanisms are discussed. Modification of acoustic anomalies under ferroelastic superionic phase transition at low frequencies (25 MHz) is considered as arising from the disguising effects caused by the velocity dispersion.
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