Phase transition in a superprotonic conductor Cs2(HSO4)(H2PO4) induced by water vapor |
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| Affiliation: | 1. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Aichi, 441-8580, Japan;2. Institute of Liberal Arts and Sciences, Toyohashi University of Technology, Aichi, 441-8580, Japan;1. Romanian Academy, Institute of Physical Chemistry ‘‘Ilie Murgulescu”, Spl. Independentei 202, 060021 Bucharest, Romania;2. Babes-Bolyai University, Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences, 400084 Cluj-Napoca, Romania;1. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan;2. Institute of Liberal Arts and Science, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan |
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| Abstract: | ![]()
Phase transitions and thermal history in Cs2(HSO4)(H2PO4) were analyzed using powder X-ray diffraction method. A high-temperature phase (phase HT), which is a superprotonic phase, was retained on cooling even after 7 days in dry gas atmospheres at 298 K (room-temperature). On the other hand, phase HT did not transform to an original room-temperature phase (phase RT) but to another phase under room temperature and air atmosphere with 60% humidity. The new phase can be the same as the previously reported phase RT2 by means of 1H NMR [S. Hayashi, M. Mizuno, Solid State Ionics 176 (2005) 745.]. It is revealed that water vapor in atmosphere affects the phase transition, resulting in these large thermal histories. |
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