Interrelationship between superprotonic conductivity and strain in CsHXO4 |
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Authors: | Yasumitsu Matsuo Junko Hatori Yukihiko Yoshida Yutaka Ikedo Jun Sugiyama Seiichiro Ikehata |
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Affiliation: | aSetsunan University, 17-8 Ikeda-Nakmachi, Neyagawa-shi, Osaka, Japan;bTokyo University of Science, 1-3 Kagrazaka, Shinjyukuku, Tokyo, Japan;cToyota Central Research & Development Laboratories. Inc., Nagakute, Aichi, Japan |
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Abstract: | In order to clarify the mechanism of superprotonic conductivity (SPC) for the hydrogen-bonded compound CsHXO4 (X=S, Se), we have investigated the elastic properties of CsHXO4 with various transition temperatures (Tc), at which CsHXO4 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 CsHSxSe1 − xO4 (x=0–1), the transition temperature Tc decreases in proportion to the square of spontaneous strain b in the aII–bII plane of phase II. This result indicates that the spontaneous strain in the aII–bII plane plays an important role in the appearance of SPC in CsHXO4. 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 CsHXO4 is determined by the competition between the kinetic energy of proton and the released-strain energy. |
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Keywords: | Elasticity Phase transitions X-ray |
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