Refine your search�ソスF     
Report No.
 - 

Phase transition and internal crystal structure 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  

The materials, M$$_{3}$$H(XO$$_{4}$$)$$_{2}$$ (M=alkaline metal, X=Se, S), exhibit high protonic conductivities in a relatively low temperature region. The high protonic conductivities emerge upon a structural phase transition and the phase transition temperature (Tc) varies depending on the elements of M and X. In this study, mixed materials, Rb$$_{3-x}$$K$$_{x}$$H(SeO$$_{4}$$)$$_{2}$$, were studied by means of conductivity measurements and single crystal neutron structure analyses in order to clarify how the elements at the M site affect the Tc from the structural aspect. The conductivity measurements revealed that the Tc decreased as the K content increased. The variation of the Tc was found to be non-linear with respect to the K content. The structure analyses showed that the K ions preferred to occupy one of two M sites and the occupancy of the K ion at this site non-linearly varied. In addition, the SeO$$_{4}$$ tetrahedron became more distorted as the K content increased, suggesting the close relationship between the distortion and the Tc.

Accesses

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.