Transport properties in (Na,Ca)Co2O4 ceramics

被引：17

作者：

Itoh, T ^{[1
]}

Kawata, T ^{[1
]}

Kitajima, T ^{[1
]}

Terasaki, I ^{[1
]}

机构：

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

来源：

XVII INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT 98 | 1998年

关键词：

D O I：

10.1109/ICT.1998.740449

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The resistivity and thermopower of polycrystalline Na1.1-xCaxCo2O4 were measured and analyzed. Both the quantities increase with x, suggesting that the carrier density is decreased by the substitutions of Ca2+ for Na+. Considering that the temperature dependence of the resistivity show a characteristic change with a:, the conduction mechanism is unlikely to come from a simple electron-phonon scattering. As a reference for NaCo2O4, single crystals of a two-dimensional Co oxide Bi2-xPbxM3Co2O9 (M =Sr and Ba) were studied. The Pb substitution decreases the resistivity, leaving the thermopower nearly intact.

引用

页码：595 / 597

页数：3