RAMAN-SCATTERING STUDY OF THE NON-FERROIC PHASE-TRANSITION OF RBALF

被引：19

作者：

BULOU, A

ROUSSEAU, M

NOUET, J

机构：

[1] Lab. P.E.C. U.R.A 807 Univ. du Maine

来源：

FERROELECTRICS | 1990年 / 104卷

关键词：

D O I：

10.1080/00150199008223842

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The P4/mmm - P4/mbm structural phase transition of RbA1F4 at 553 K is studied in the framework of the Landau theory with a free energy involving two coupled order parameters. The model deduced from the anisotropy of the phonon dispersion curves relative to the soft mode makes it possible to explain the first-order character of the transition and to predict the existence of a new phase with P4/mmm symmetry. A Raman scattering study of the temperature behaviour of the soft mode is in agreement with such prediction. © 1990, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：373 / 377

页数：5

共 11 条

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