RAMAN-SCATTERING STUDY OF KFEF4

被引：3

作者：

DESERT, A

BULOU, A

NOUET, J

机构：

[1] Lab. de Phys. de l'Etat Condense, Maine Univ., Le Mans

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1992年 / 4卷 / 04期

关键词：

D O I：

10.1088/0953-8984/4/4/013

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The layered compound KFeF4 that exhibits a structural phase transition at T(c) congruent-to 380 K from Bmmb symmetry (phase I) to Pcmn symmetry (phase 11) is studied as a function of temperature by polarized Raman scattering. All the Raman lines are attributed on the basis of (i) symmetry analysis of the normal modes of vibration in the aristotype phase (phase I) and the compatibilities relations with the symmetries in phase II; (ii) comparison with RbFeF4 in which the phonon spectrum can be calculated. The phase transition is clearly associated with a soft mode but a residual Raman signal is still observed above T(c); this is attributed to the existence of a disordered phase. Two additional modes exhibit a soft behaviour connected with a (virtual) martensitic transformation.

引用

页码：1023 / 1037

页数：15

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