STRUCTURAL STUDY OF PHASE-TRANSITION IN LANGBEINITE-TYPE K2MN2(SO4)(3) CRYSTALS

被引：22
|
作者：
UKEDA, T
ITOH, K
MORIYOSHI, C
机构：
[1] Department of Materials Science, Faculty of Science, Hiroshima University
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 02期
关键词：
K2MN2(SO4)(3); CRYSTAL STRUCTURE ANALYSIS; PHASE TRANSITION;
D O I：
10.1143/JPSJ.64.504
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Accurate crystal structure of K2 Mn-2 (SO4)(3) was determined at several temperatures in the high-temperature phase. It turns out from the split-atom calculation that the SO4 ion takes two reorientational arrangements as has been implied in the early studies. Thermal vibrations of all the constituent atoms become large with approaching the phase transition temperature. We conclude that the coexistence of the disordered motions and the soft vibrations arises from the short Mn-O distances which govern the driving mechanism of the phase transition.
引用
收藏
页码：504 / 512
页数：9
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