CHANGES OF OPTICAL-PROPERTIES AT AN INCOMMENSURATE-COMMENSURATE PHASE-TRANSITION IN (NH4)2BEF4 CRYSTALS

被引：27

作者：

KONAK, C

机构：

[1] Institute of Physics, Czechoslovak Academy of Sciences

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 1979年 / 54卷 / 01期

关键词：

D O I：

10.1002/pssa.2210540112

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The optical properties of ammonium fluoberyllate in the incommensurate phase, namely birefringent and electrooptical ones, are discussed within the framework of a thermodynamic theory. The analysis of experimental results show that the incommensurate‐commensurate phase transition in AFB is nearly of second order. The soft‐mode and electrooptic contributions to the spontaneous birefringence are found to be small in comparison with the elastooptic one. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA

引用

页码：99 / 104

页数：6

共 20 条

[1] OPTICAL PROPERTIES OF FERROELECTRICS - DIGRESSIONS FROM PHENOMENOLOGICAL THEORY [J].