Ca/sub 3/Co/sub 4/O/sub 9+/spl δ基多晶氧化物的热电性能

Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589) Pub Date : 2001-06-08 DOI:10.1109/ICT.2001.979869

J. Nan, Junbo Wu, Xisong Zhou, Shengli Chen, C. Nan

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引用次数: 1

摘要

氧化物陶瓷由于其在余热发电方面的特殊应用潜力，近年来作为热电材料备受关注。本文采用溶胶-凝胶法制备了(Na/sub x/Ca/sub 1-x/)/sub 3/Co/sub 4/O/sub 9+/spl delta// (x=0.05-0.2)层状结构的多晶样品。电导率、功率因数和导热系数基本随温度升高而增大。样品(Na/sub x/Ca/sub 1-x/)/sub 3/Co/sub 4/O/sub 9+/spl δ // (x=0.05-0.2)，在700/spl℃时的优值值约为1.1/spl倍/10/sup -4/ K/sup -1/。

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Thermoelectric properties of Ca/sub 3/Co/sub 4/O/sub 9+/spl delta//-based polycrystalline oxides

Oxide ceramics have recently attracted much attention as candidate thermoelectric materials due to their special potential for applications in power generation using waste heat. In this paper, (Na/sub x/Ca/sub 1-x/)/sub 3/Co/sub 4/O/sub 9+/spl delta// (x=0.05-0.2) polycrystalline samples with a layered structure were prepared by a sol-gel method followed by a low-temperature sintering procedure. The electrical conductivity, the power factor and thermal conductivity basically increase with increasing temperature. The figure of merit is smaller than that of traditional thermoelectric alloys, which is about 1.1/spl times/10/sup -4/ K/sup -1/ at 700/spl deg/C in the sample (Na/sub x/Ca/sub 1-x/)/sub 3/Co/sub 4/O/sub 9+/spl delta// (x=0.05-0.2).

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Proceedings ICT2001. 20 International Conference on Thermoelectrics (Cat. No.01TH8589)

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