ENERGETICS OF THE OXYGEN VACANCY ORDER-DISORDER TRANSITION IN BA2IN2O5

被引：31

作者：

PRASANNA, TRS ^{[1
]}

NAVROTSKY, A ^{[1
]}

机构：

[1] PRINCETON UNIV,PRINCETON MAT INST,PRINCETON,NJ 08544

来源：

JOURNAL OF MATERIALS RESEARCH | 1993年 / 8卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/JMR.1993.1484

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The heat capacity and the enthalpy associated with the reported oxygen vacancy order-disorder transition in Ba2In2O5 were measured by high temperature step scanning calorimetry. The transition temperature is 1205 +/- 2 K. The transition appears first order or nearly so. The enthalpy and entropy of transition are 1.3 kJ/mol and 1.1 J/mol K, respectively. The latter is only 4.8% of the configurational entropy, arising from mixing one vacancy and five oxygens per formula unit, 22.5 J/mol K. This suggests that the transition involves only a small fraction of the oxygen vacancies and implies extensive short-range order, SRO, in the high temperature phase.

引用

页码：1484 / 1486

页数：3