Relation between crystal structure and phase transition of superprotonic conductor, Rb $_{3-x}$ K $_{x}$ H(SeO $_{4}$ ) $_{2}$

Kiyanagi, Ryoji ; Matsuo, Yasumitsu*; Ohara, Takashi ; Kawasaki, Takuro ; Oikawa, Kenichi ; Kaneko, Koji ; Tamura, Itaru ; Hanashima, Takayasu*; Munakata, Koji*; Nakao, Akiko*; Kawakita, Yukinobu

M $_{3}$ H(SeO $_{4}$ ) $_{2}$ forms a material group that exhibits superprotonic conductivity at rather low temperature. The superprotonic conductivity manifests itself upon a structural phase transition. The phase transition temperature varies depending on the elements of M and X. In order to clarify the relation between the crystal structure and the phase transition, Rb $_{3-x}$ K $_{x}$ H(SeO $_{4}$ ) $_{2}$ was investigated by means of a conductivity measurement and single crystal neutron structure analyses. The phase transition temperature was found to be non-linear to the variation of x by the conductivity measurement. The structure analyses revealed that the site occupancy of K at one of two M sites non-linearly varied with respect to x. This suggest that a close relation between the M site and the superprotonic phase transition.

Language	:	English
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Meeting title	:	12th Conference of the Asian Crystallographic Association (AsCA 2013)
Held date	:	2013/12
Location (city)	:	Hong Kong
Location (country)	:	China
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Keywords	:	no keyword
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : BB20132431
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Relation between crystal structure and phase transition of superprotonic conductor, RbKH(SeO)

Relation between crystal structure and phase transition of superprotonic conductor, Rb $_{3-x}$ K $_{x}$ H(SeO $_{4}$ ) $_{2}$