RAMAN-SPECTRA OF CH3NH3AL(SO4)2.12H2O AND (CH3)2NH2AL(SO4)2.GH2O CRYSTALS

被引：9

作者：

TORGASHEV, VI ^{[1
]}

YUZYUK, YI ^{[1
]}

KIRPICHNIKOVA, LF ^{[1
]}

SHUVALOV, LA ^{[1
]}

机构：

[1] ACAD SCI USSR,INST CRYSTALLOG,MOSCOW V-71,USSR

来源：

FERROELECTRICS | 1990年 / 110卷

关键词：

D O I：

10.1080/00150199008015284

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Raman spectra of CH3NH3A1(S04)212H2O and (CH3)2NH2A1(SO4)2xH2O crystals have been studied in the temperature range 100 < T < 300 K. It has been shown that substitution of the second hydrogen atom in the ammonium group results in substantial changes in the spectra due to the reduction of the crystal symmetry to monoclinic. It has been established that the ferroelectric phase transition observed in dimethylammoniumaluminiumsulphate crystals at 150 K is associated with the changes in the orientational mobility of the sulphate and dimethylamine sublattices and is related to the orderdisorder transitions. © 1990, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：13 / 20

页数：8