STRUCTURAL PHASE-TRANSITIONS IN KCAF3

被引：5

作者：

AKIYAMA, H ^{[1
]}

HIDAKA, M ^{[1
]}

机构：

[1] KYUSHU UNIV 33,DEPT PHYS,FUKUOKA 812,JAPAN

来源：

PHASE TRANSITIONS | 1990年 / 27卷 / 01期

关键词：

STRUCTURAL PHASE TRANSITIONS; KCAF3;

D O I：

10.1080/01411599008206898

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

A focusing X-ray diffractometer, consisted of a Johansson type monochromator and a position-sensitive proportional counter, has been developed. By using the diffractometer, a study of the structural phase transition in the perovskite compound KCaF3has been carried out. The mechanism for the transition is discussed in terms of the condensation of soft modes. It is found that KCaF3shows two structural-phase-transitions at 556 and 565 K, which are characterized as first-order transitions; at 565 K the Mz 3and Rx 2.5soft modes condense simultaneously, while at 556 K the R7 2.5soft mode condenses. © 1990, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：37 / 49

页数：13

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