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The series impedance method and Brillouin scattering technique are applied to study elastic properties of K4LiH3(SO4)4 (KLHS) in the temperature range from 90 to 300 K. A strong increase in damping of piezoelectric vibrations for T → TC (TC = 115 K) together with a change in the slope of the function ϱv2(T) at TC are observed for three longitudinal phonons propagating in the directions [100], [110], and [001]. The observed temperature changes in elastic properties of KLHS point to the nonferroelastic character of the phase transition of this crystal at 115 K.
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Mróz et al. (1989) studied this question.
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