Low temperature phase transitions and crystal structure of Na0.5CoO2

被引：161

作者：

Huang, Q ^{[1
]}

Foo, ML

Lynn, JW

Zandbergen, HW

Lawes, G

Wang, YY

Toby, BH

Ramirez, AP

Ong, NP

Cava, RJ

机构：

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

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

[3] Delft Univ Technol, Dept Nanosci, Natl Ctr HREM, NL-2628 AL Delft, Netherlands

[4] Los Alamos Natl Lab, Dept Thermal Phys, Los Alamos, NM 87544 USA

[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[6] Lucent Technol Bell Labs, Murray Hill, NJ 07574 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2004年 / 16卷 / 32期

关键词：

D O I：

10.1088/0953-8984/16/32/016

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Specific heat measurements on Na0.5CoO2 show that the transitions observed at 87 and 53 K in the resistivity and magnetic susceptibility are accompanied by changes in entropy, whereas the one near 20 K is not. Electron diffraction studies suggest that the 87 K transition has a structural component. The crystal structure of Na0.5CoO2, determined by powder neutron diffraction, consists of layers of edge-shared CoO6 octahedra in a triangular lattice, with Na ions occupying ordered positions in the interleaving planes. The Na ions form one-dimensional zigzag chains. Two types of Co ions are also found in chains.

引用

页码：5803 / 5814

页数：12

共 14 条

[1]

[Anonymous], UNPUB

[2] ELECTROCHEMICAL INTERCALATION OF SODIUM IN NAXCOO2 BRONZES [J].