HEAT-CAPACITY MEASUREMENT OF THE SUCCESSIVE PHASE-TRANSITIONS IN CS2ZNI4

被引：6

作者：

MELERO, JJ ^{[1
]}

BARTOLOME, J ^{[1
]}

BURRIEL, R ^{[1
]}

ALEKSANDROVA, IP ^{[1
]}

PRIMAK, S ^{[1
]}

机构：

[1] RUSSIAN ACAD SCI,LV KIRENSKY PHYS INST,SIBERIAN BRANCH,KRASNOYARSK 660036,RUSSIA

来源：

SOLID STATE COMMUNICATIONS | 1995年 / 95卷 / 04期

关键词：

FERROELECTRICS; HEAT CAPACITY; PHASE TRANSITIONS; INCOMMENSURATE PHASES;

D O I：

10.1016/0038-1098(95)00261-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The heat capacity of a Cs2ZnI4 single crystal has been measured by means of AC calorimetry. Three anomalies have been detected corresponding to a normal to inconmensurate phase transition at T-I = 116.9+/-0.1 K, an incommensurate to commensurate lock-in transition at T-L = 107.58+/-0.05 K, and a structural transition from a commensurate orthorhombic to a monoclinic phase at T-C = 93.77+/-0.05 K with thermal hysteresis. The lock-in transition has the peculiarity of being discontinuous but not showing any measurable hysteresis. After comparison with the Landau model predictions for the heat capacity, derived for the k(Delta) = (1/2 + Delta)a* case, it is concluded that Cs2ZnI4 lies close to the Lifschitz point of coexistence of the normal, incommensurate and commensurate phases.

引用

页码：201 / 206

页数：6

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