Thermoelectric properties of the Bi- and Na- substituted Ca3Co4O9 system

被引：186

作者：

Xu, GJ ^{[1
]}

Funahashi, R ^{[1
]}

Shikano, M ^{[1
]}

Matsubara, I ^{[1
]}

Zhou, YQ ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Osaka 5638577, Japan

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 20期

关键词：

D O I：

10.1063/1.1480115

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Bi- and Na-substituted Ca3Co4O9 polycrystalline samples have been prepared using a hot-pressing technique and their thermoelectric properties were carefully studied in air from room temperature to 1000 K. The substitutions of Bi3+ and Na+ for Ca2+, as well as Bi3+ and Na+ double substitution, cause both the electrical conductivity (sigma) and thermoelectric power (S) to increase simultaneously. The double substitution has also been demonstrated to be effective to decrease the thermal conductivity (kappa). The dimensionless figure of merit ZT (=S(2)sigmaT/kappa) reaches 0.32 at 1000 K in the double-substituted sample. (C) 2002 American Institute of Physics.

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页码：3760 / 3762

页数：3

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