Crystal structure, electric and magnetic properties of layered cobaltite β-NaxCoO2

被引：76

作者：

Ono, Y

Ishikawa, R

Miyazaki, Y

Ishii, Y

Morii, Y

Kajitani, T

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Japan Atom Energy Res Inst, Tokai, Ibaraki 3191195, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2002年 / 166卷 / 01期

关键词：

NaxCoO2; layered cobaltite; thermoelectric material; neutron diffraction; mixed valence;

D O I：

10.1006/jssc.2002.9578

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The layered oxide thermoelectric material beta-Na0.67CoO2 has been studied by powder neutron diffraction, electric and magnetic measurements. This compound includes an edge-sharing CoO6 slab and a highly vacant Na+ sheet in a unit cell (space group symmetry C2/m, a = 4.9023(4) Angstrom, b = 2.8280(2) Angstrom, c = 5.7198(6) Angstrom and beta = 105.964(6)degrees at 300 K). The evaluated formal valence of cobalt ion, +3.33(l), is ascribed to the coexistence of Co3+ and Co4+ in the ratio 2:1. Polycrystalline beta-Na0.67CoO2, a p-type thermoelectric material, exhibits metallic behavior of the electric resistivity below 300 K. The Curie-Weiss-type magnetic susceptibility indicates antiferromagnetic interactions between magnetic cobalt ions in the edge-sharing CoO6 slab. (C) 2002 Elsevier Science (USA).

引用

页码：177 / 181

页数：5

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