CALORIMETRIC AND RAMAN-STUDY OF THE PHASE-TRANSITION IN [N(CH3)4]2ZNBR4

被引：20

作者：

IGARTUA, JM ^{[1
]}

RUIZLARREA, I ^{[1
]}

COUZI, M ^{[1
]}

LOPEZECHARRI, A ^{[1
]}

BRECZEWSKI, T ^{[1
]}

机构：

[1] UNIV BORDEAUX 1, DEPT FIS APLICADA 2, SPECTROSCOPIE MOLEC & CRISTALLINE LAB, F-33405 TALENCE, FRANCE

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 1991年 / 168卷 / 01期

关键词：

D O I：

10.1002/pssb.2221680106

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Raman scattering and calorimetric measurements are used to study the ferro-paraelastic phase transition undergone by [N(CH3)4]2ZnBr4 at 287.19 K. The knowledge of its vibrational spectrum. together with the available elastic and thermal expansion data, allow to obtain the specific heat of the phase transition and the associated values for the thermodynamic functions. The transition entropy (DELTA-S = 1.95 R +/- 0.1) confirms the order-disorder character assigned to this phase transition. Finally. the temperature dependence of the thermodynamic functions is discussed within the frame of the Landau theory.

引用

页码：67 / 79

页数：13

共 24 条

[1] REFINEMENT OF THE CRYSTAL-STRUCTURE OF [N(CH3)4]2ZNBR4 IN CONNECTION WITH ITS PHASE-TRANSITION [J].