Effects of double filling of Pb and Ba on thermoelectric properties of PbxBayCo4Sb11.5Te0.5 compounds by HPHT |
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Authors: | L. Deng T.C. Su X. Guo H.A. Ma |
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Affiliation: | a National Lab of Superhard Materials, Jinlin University, Changchun 130012, Chinab Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China |
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Abstract: | Skutterudite compounds PbxBayCo4Sb11.5Te0.5 (x≤0.23,y≤0.27) with bcc crystal structure have been prepared by the high pressure and high temperature (HPHT) method. The study explored a chemical method for filling Pb and Ba atoms into the voids of CoSb3 to optimize the thermoelectric figure of merit ZT in the system of PbyBaxCo4Sb11.5Te0.5. The structure of PbxBayCo4Sb11.5Te0.5 skutterudites was evaluated by means of X-ray diffraction. The Seebeck coefficient, electrical resistivity and power factor were performed from room temperature to 710 K. Compared with Co4Sb11.5Te0.5, the thermal conductivity of Pb and Ba double-filled samples was reduced evidently. Among all filled samples, Pb0.03Ba0.27Co4Sb11.5Te0.5 showed the highest power factor of 31.64 μW cm−1 K−2 at 663 K. Pb0.05Ba0.25Co4Sb11.5Te0.5 showed the lowest thermal conductivity of 2.73 W m−1 K−1 at 663 K, and its maximum ZT value reached 0.63 at 673 K. |
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Keywords: | A. CoSb3 C. Skutterudite D. Thermoelectric properties E. HPHT |
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