HYDROGEN REARRANGEMENTS IN CSHSEO4 ACCOMPANIED WITH BOTH THE PHASE-TRANSITION AND DOMAIN-BOUNDARY-MOVEMENT

被引：18

作者：

KOMUKAE, M ^{[1
]}

TANAKA, M ^{[1
]}

OSAKA, T ^{[1
]}

MAKITA, Y ^{[1
]}

KOZAWA, K ^{[1
]}

UCHIDA, T ^{[1
]}

机构：

[1] SCI UNIV TOKYO,FAC SCI & TECHNOL,DEPT IND & ENGN CHEM,NODA,CHIBA 278,JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1990年 / 59卷 / 01期

关键词：

crystal structure; CsHSeO4; domain structure; ferroelastics; hydrogen bond; superionic conductivity;

D O I：

10.1143/JPSJ.59.197

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Hydrogen rearrangements accompanied with the movement of domain boundaries in CsHSeO4 below the ferroelastic phase transition temperature (Tc=128°C) and possible motional states of hydrogens above Tc were studied based on the crystal structure obtained in the X-ray re-examination at room temperature and twinning conditions for ferroelastic domains observed below Tc. The crystal was confirmed to be monoclinic with the space group P21/c and to have a superlattice structure below Tc, while it is tetragonal with the space group I41/amd above Tc. It was deduced by taking account of symmetry change from P21/c to I41amd and twinning conditions that the hydrogen bonds in CsHSeO4 above Tc are broken instantaneously and the hydrogens are hopping among the 16-fold (f) equivalent positions, leading to so called three-dimensional superionic conductivity of hydrogens above Tc. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：197 / 206

页数：10

共 12 条

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