Enhanced thermoelectric properties of Co1-x-yNix+ySb3-xSnx materials

Hong-quan Liu; Sheng-nan Zhang; Tie-jun Zhu; Xin-bing Zhao; Yi-jie Gu; Hong-zhi Cui

doi:10.1007/s12613-012-0545-y

Volume 19 Issue 3

Mar. 2012

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文章导航 > 矿物冶金与材料学报（英文） > 2012 > 19(3): 240-244

Hong-quan Liu, Sheng-nan Zhang, Tie-jun Zhu, Xin-bing Zhao, Yi-jie Gu, and Hong-zhi Cui, Enhanced thermoelectric properties of Co_1-x-yNi_x+ySb_3-xSn_x materials, Int. J. Miner. Metall. Mater., 19(2012), No. 3, pp. 240-244. https://doi.org/10.1007/s12613-012-0545-y

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Hong-quan Liu, Sheng-nan Zhang, Tie-jun Zhu, Xin-bing Zhao, Yi-jie Gu, and Hong-zhi Cui, Enhanced thermoelectric properties of Co1-x-yNix+ySb3-xSnx materials, Int. J. Miner. Metall. Mater., 19(2012), No. 3, pp. 240-244. https://doi.org/10.1007/s12613-012-0545-y

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Enhanced thermoelectric properties of Co_1-x-yNi_x+ySb_3-xSn_x materials

College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China
State Key Laboratory of Silicon Materials, Development of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

通讯作者:
Hong-quan Liu E-mail: hq.liu666@yahoo.com.cn

中文摘要

Co_1-x-yNi_x+ySb_3-xSn_x polycrystals were fabricated by vacuum melting combined with hot-press sintering. The effect of alloying on the thermoelectric properties of unfilled skutterudite Co_1-x-yNi_x+ySb_3-xSn_x was investigated. A leap of electrical conductivity from the Co_0.93Ni_0.07Sb_2.93Sn_0.07 sample to the Co_0.88Ni_0.12Sb_2.88Sn_0.12 sample occurs during the measurement of electrical conductivity, indicating the adjustment of band structure by proper alloying. The results show that alloying enhances the power factor of the materials. On the basis of alloying, the thermoelectric properties of Co_0.88Ni_0.12Sb_2.88Sn_0.12 are improved by Ni-doping. The thermal conductivities of Ni-doping samples have no reduction, but their power factors have obvious enhancement. The power factor of Co_0.81Ni_0.19Sb_2.88Sn_0.12 reaches 3.0 mW·m^-1·K^-2 by Ni doping. The dimensionless thermoelectric figure of merit reaches 0.55 at 773 K for the unfilled Co_0.81Ni_0.19Sb_2.88Sn_0.12.

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Enhanced thermoelectric properties of Co_1-x-yNi_x+ySb_3-xSn_x materials

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Abstract

Abstract

Co_1-x-yNi_x+ySb_3-xSn_x polycrystals were fabricated by vacuum melting combined with hot-press sintering. The effect of alloying on the thermoelectric properties of unfilled skutterudite Co_1-x-yNi_x+ySb_3-xSn_x was investigated. A leap of electrical conductivity from the Co_0.93Ni_0.07Sb_2.93Sn_0.07 sample to the Co_0.88Ni_0.12Sb_2.88Sn_0.12 sample occurs during the measurement of electrical conductivity, indicating the adjustment of band structure by proper alloying. The results show that alloying enhances the power factor of the materials. On the basis of alloying, the thermoelectric properties of Co_0.88Ni_0.12Sb_2.88Sn_0.12 are improved by Ni-doping. The thermal conductivities of Ni-doping samples have no reduction, but their power factors have obvious enhancement. The power factor of Co_0.81Ni_0.19Sb_2.88Sn_0.12 reaches 3.0 mW·m^-1·K^-2 by Ni doping. The dimensionless thermoelectric figure of merit reaches 0.55 at 773 K for the unfilled Co_0.81Ni_0.19Sb_2.88Sn_0.12.
- thermoelectric material;
- polycrystals;
- skutterudites;
- alloying;
- thermoelectric properties;
- dopping