Na-site substitution effects on the thermoelectric properties of NaCo2O4

被引：114

作者：

Kawata, T

Iguchi, Y

Itoh, T

Takahata, K

Terasaki, I ^{[1
]}

机构：

[1] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan

[2] Japan Sci Technol, Precursory Res Embryon Sci & Technol, Tokyo 1020074, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.60.10584

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The resistivity and thermopower of Na1+xCo2O4 and Na1.1-xCaxCo2O4 are measured and analyzed. In Na1+xCo2O4, whereas the resistivity increases with x, the thermopower is nearly independent of x. This suggests that the excess Na is unlikely to supply carriers, and decreases effective conduction paths in the sample. In Na1.1-xCaxCo2O4, the resistivity and the thermopower increase with x, and the Ca2+ substitution for Na+ reduces the majority carriers in NaCo2O4. This means that they are holes, which is consistent with the positive sign of the thermopower. Strong correlation in this compound is evidenced by the peculiar temperature dependence of the resistivity. [S0163-1829(99)00536-6].

引用

页码：10584 / 10587

页数：4

共 19 条

[1] Specific-heat evidence for strong electron correlations in the thermoelectric material (Na,Ca) Co2O4 [J].