Abstract
The velocity of quasi-longitudinal acoustic (QLA) phonons in (NH4)3H(SO4)2 (TAHS) crystals was studied by Brillouin scattering in the temperature range from 295 to 430 K. It was found that the QLA phonon velocity in the vicinity of a superionic ferroelastic phase transition (T c=413 K) exhibits anomalous temperature dependence. At T<T c, an additional contribution is separated from the temperature dependence of the hypersound velocity, the behavior of which is correlated with variations of the conductivity of a TAHS crystal. Based on an analysis of the experimental data, a thermoactivation mechanism explaining the anomalous behavior of the QLA phonon velocity is proposed and the corresponding activation energy is estimated.
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