A RAMAN-STUDY OF THE HIGH-TEMPERATURE PHASE-TRANSITION IN LITHIUM AMMONIUM-SULFATE

被引：16

作者：

HOSSAIN, MA

SRIVASTAVA, JP

KHULBE, PK

MENON, L

BIST, HD

机构：

[1] ALIGARH MUSLIM UNIV,DEPT PHYS,ALIGARH 202002,INDIA

[2] INDIAN INST TECHNOL,DEPT PHYS,KANPUR 208016,UTTAR PRADESH,INDIA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1994年 / 55卷 / 01期

关键词：

HIGH TEMPERATURE PHASE TRANSITION; LINH4SO4; FERROELECTRIC;

D O I：

10.1016/0022-3697(94)90187-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The temperature dependence of the Raman scattering from LiNH4SO4 has been studied to investigate the phase transition at 459.5 K, which is found to be of second-order type. The crystals show increased ordering of the molecular ions at room temperature, the sulphate ion sublattice being severely distorted in the ferroelectric state. The reorientational motion of the sulphate ions appears to be mainly responsible for the observed order disorder transition. The ferroelectric state of the crystal is characterized by stronger hydrogen bonds.

引用

页码：85 / 90

页数：6

共 24 条

[1]

ACHARYA PK, 1973, INDIAN J PURE AP PHY, V11, P514

[2] AN IR STUDY OF THE PHASES OF LITHIUM AMMONIUM-SULFATE [J].