Enhanced thermoelectric performance of dual-element-filled skutterudites BaxCeyCo4Sb12 |
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| Authors: | SQ Bai YZ Pei LD Chen WQ Zhang XY Zhao J Yang |
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| Affiliation: | 1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate University of Chinese Academy of Sciences, Beijing, China;3. Materials and Processes Laboratory, GM R&D Center, Warren, MI 48090, USA |
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| Abstract: | Single-phase polycrystalline dual-element-filled skutterudites BaxCeyCo4Sb12 (0 < x < 0.4, 0 < y < 0.1) are synthesized by the melting–quenching–annealing and spark plasma sintering methods. The electrical conductivity, Seebeck coefficient, thermal conductivity and low-temperature Hall data of these compounds are reported. Our results suggest that there is essentially no difference in electrical transport properties between the dual-element-filled BaxCeyCo4Sb12 and single-element-filled BayCo4Sb12 systems. The Ba–Ce co-filling is more effective in lattice thermal conductivity reduction than Ba single filling in the temperature range of 300–850 K. Very low lattice thermal conductivity values less than 2.0 W m?1 K?1 are obtained at room temperature. Consequently, enhanced thermoelectric figure of merits (ZT) for these dual-element-filled CoSb3 skutterudites are achieved at elevated temperatures, in particular ZT = 1.26 at 850 K for Ba0.18Ce0.05Co4Sb12.02. |
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