Characterization of the structural transition in Na0.75CoO2

被引：16

作者：

Huang, Q ^{[1
]}

Lynn, JW

Toby, BH

Foo, ML

Cava, RJ

机构：

[1] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2005年 / 17卷 / 12期

关键词：

D O I：

10.1088/0953-8984/17/12/007

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In the NaxCoO2 chemical system, a two-phase region is found at ambient temperature near x = 0.75. The manner in which that two-phase region is formed on cooling from a uniform single phase at temperatures above 340 K is reported here. The driving force that induces the phase separation appears to be a difference in Na composition of the two phases, which, though small, is accompanied by substantial differences in the unit cell parameters. Hysteretic behaviour in the transition is observed. One of the phases exhibits negative thermal expansion in the narrow temperature region where the phases are in the process of separating.

引用

页码：1831 / 1840

页数：10

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