Thermoelectric properties of highly textured NaCo2O4 ceramics processed by the reactive templated grain growth (RTGG) method

被引：102

作者：

Tajima, S

Tani, T

Isobe, S

Koumoto, K

机构：

[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan

[2] Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Nagoya, Aichi 4648603, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2001年 / 86卷 / 01期

关键词：

NaCo2O4; Co3O4; thermoelectric properties; RTGG method; preferred orientation;

D O I：

10.1016/S0921-5107(01)00633-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Highly-textured NaCo2O4 ceramics were prepared and the thermoelectric properties were examined in the preferred {001} plane. Plate-like Co3O4 particles were synthesized and used as a reactive template for c-axis oriented NaCo2O4 ceramics. Tape casting of the template particles with Na2CO2 and the following in-situ reaction produced grain-oriented ceramics topotaxially as designed. The textured ceramic specimen had in-plane electrical conductivity: 600-300 S cm(-1), Seebeck coefficient, 60-120 VV K-1 and thus power factor: 2-5 x 10(-4) W mK(-2) in the temperature range from room temperature to 700 degreesC. A large excess amount of Na and inhomogeneity in its distribution could be attributed to the lower transport properties than expected from those of a single crystal. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：20 / 25

页数：6

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