Abstract
In order to clarify the mechanism of superprotonic conductivity (SPC) for the hydrogen-bonded compound CsHXO 4 ( X = S , Se), we have investigated the elastic properties of CsHXO 4 with various transition temperatures ( T c ), at which CsHXO 4 exhibits a structural phase transition from a low-temperature monoclinic phase with low protonic conductivity (phase II) to a high-temperature SPC phase (phase I). It was found that, in CsHS x Se 1 − x O 4 ( x = 0 – 1 ), the transition temperature T c decreases in proportion to the square of spontaneous strain b in the a II – b II plane of phase II. This result indicates that the spontaneous strain in the a II – b II plane plays an important role in the appearance of SPC in CsHXO 4. Moreover, thermodynamic analyses suggest that proton migration in phase I is induced by the release of the strain energy. From these results, it is deduced that the phase transition temperature in CsHXO 4 is determined by the competition between the kinetic energy of proton and the released-strain energy.
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