Thermoelectric properties of YbxCo4Sb12 system

YbxCo4Sb12 polycrystals were fabricated by vacuum melting combined with hot-press sintering. The effect of Yb-filling on thermoelectric property of unfilled skutterudite CoSb3 was investigated, which indicated the enhancement of the power factor of the material. Transport properties of materials cha...

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Bibliographic Details
Published in:Journal of rare earths 2012-05, Vol.30 (5), p.456-459
Main Authors: LIU, Hongquan, ZHAO, Xinbing, ZHU, Tiejun, GU, Yijie
Format: Article
Language:English
Subjects:
power factor
rare earths
thermal conductivity
thermoelectric properties
Yb-filling
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Summary:YbxCo4Sb12 polycrystals were fabricated by vacuum melting combined with hot-press sintering. The effect of Yb-filling on thermoelectric property of unfilled skutterudite CoSb3 was investigated, which indicated the enhancement of the power factor of the material. Transport properties of materials changed from semi-conductor to semi-metal during the measurement of electrical conductivity, which indicated the change of electronic band structure. The maximum value of electrical conductivity was about 190000 S/m at 300 K for all samples. On the basis of Yb-filling, power factor of Yb0.2Co4Sb12 reached 5–6 mW/(mK) during the measurement temperature. Thermal conductivity decreased with increase of Yb content, and the thermal conductivity of Yb0.2Co4Sb12 reached 3.2 W/(mK) at 600 K. The ZT value of Yb0.2Co4Sb12 reached 1.16 at 700 K due to positive contribution from high power factor and low thermal conductivity.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60072-6