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Thermoelectric properties of Ca₃Co₄O_9+δ with Lu substitution

Author： Tang G. Wang Z. Xu X. Qiu L. Xing L. Du Y.

Publisher： Springer Publishing Company

ISSN： 0022-2461

Source： Journal of Materials Science, Vol.45, Iss.15, 2010-08, pp. : 3969-3973

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

A series of Ca_3−xLu_xCo₄O_9+δ (x = 0, 0.1, 0.2, and 0.4) has been prepared by sol–gel method. The effects of Lutetium substitution on thermoelectric properties of Ca₃Co₄O_9+δ have been systematically investigated from 4 to 335 K. With the partial substitution of Lu³⁺ for Ca²⁺, the resistivity and thermopower for Lu-doped samples increase, while their thermal conductivity decreases. The dimensionless figure of merit for Ca_2.8Lu_0.2Co₄O_9+δ material (ZT = 0.032) is about five times better than that for Ca₃Co₄O_9+δ (ZT = 0.007) at 335 K. Strikingly, for Lu-doped samples, the thermopower exhibits a steeper upturn at low temperatures.

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