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Enhanced thermoelectric properties of Co1?x?yNix+ySb3?xSnxmaterials

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


Journal:
International Journal of Minerals, Metallurgy and Materials


Issue Date:
2012


Abstract(summary):

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 0.19 Sb 2.88Sn 0.12.


Page:
240-244


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