FIR SPECTROSCOPY STUDY OF THE 1ST-ORDER PHASE-TRANSITION OF (CH3CH2NH3)2CDCL4

被引：8

作者：

PEYRARD, M ^{[1
]}

PERRET, R ^{[1
]}

机构：

[1] FAC SCI MIRANDE,CHIM MINERALE LAB,F-21000 DIJON,FRANCE

来源：

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH | 1979年 / 52卷 / 02期

关键词：

D O I：

10.1002/pssa.2210520220

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependence of the far infrared reflectivity of the layer compound (CH3CH2NH3)2·CdCl4 are investigated from 120 to 300 K. Only small frequency shifts are observed at the order disorder OLT‐ORT phase transition, but some normal modes are drastically broadened. The line broadening results are compared to the X‐ray investigation data on the disordered motions in the ORT phase. The anisotropy of the observed line broadening effects reproduces the thermal motions anisotropy and consequently it is proposed to explain this broadening by the disorder effects. The mechanisms connecting the motions of the ethyl‐ammonium chains and the linewidths are discussed and a comparison with NMR results suggests that the disorder may play a dynamical role in the line broadening. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA

引用

页码：521 / 528

页数：8

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