Thermoelectric properties of Bi2.2-xPbxSr2Co2Oy system

被引：61

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：

JOURNAL OF APPLIED PHYSICS | 2002年 / 91卷 / 07期

关键词：

D O I：

10.1063/1.1455157

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polycrystalline samples of Bi2.2-xPbxSr2Co2Oy (x=0, 0.4, and 0.8) with a layered structure have been prepared using a hot pressing technique and their thermoelectric properties methodically investigated. It is found that the substitution of Pb for Bi is a fairly effective means of improving the thermoelectric properties of the Bi2.2-xPbxSr2Co2Oy system owing to resistivity (rho) decreasing and thermoelectric power (S) increasing simultaneously. The thermal conductivity (kappa) at high temperature also decreases markedly with Pb substitution. As a result, for the x=0.8 sample the dimensionless figure of merit, ZT(=(ST)-T-2/rhokappa), increases with temperature and reaches 0.26 at 1000 K, which indicates that this material is a strong candidate as a high-temperature thermoelectric material. (C) 2002 American Institute of Physics.

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页码：4344 / 4347

页数：4

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