PHASE-SEPARATION, OXYGEN COMPOSITION, AND A GLASS-TRANSITION DUE TO FREEZING-IN OF THE OXYGEN REARRANGEMENT IN LA2NIO4.094 SINGLE-CRYSTALS

被引：10

作者：

KYOMEN, T ^{[1
]}

OGUNI, M ^{[1
]}

KITAYAMA, K ^{[1
]}

ITOH, M ^{[1
]}

机构：

[1] TOKYO INST TECHNOL, ENGN MAT RES LAB, MIDORI KU, YOKOHAMA, KANAGAWA 227, JAPAN

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.52.3177

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Heat capacities of La2NiO4.094 single crystal were measured in 15-400 K with an adiabatic calorimeter. Four anomalies were found, as due to a phase separation concerning the excess oxygen composition at around 285 K, a glass transition over a wide temperature range of 150-300 K, a first-order structural transition from tetragonal to orthorhombic phases at 240 K, and an antiferromagnetic phase transition at around 55 K. The glass transition appeared as giving rise to spontaneous, exothermic at low temperatures and endothermic at high temperatures, enthalpy relaxations due to irreversible equilibration processes with respect to the compositions and configurations of excess oxygen atoms. The properties of the phase separation are discussed on the basis of the relaxation rates and the heat capacity anomaly around the separation temperature.

引用

页码：3177 / 3183

页数：7

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