Influence of Sb doping on thermoelectric properties of Mg2Ge materials |
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| Affiliation: | 1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;2. School of Materials Science and Engineering, BeiHang University, Beijing, 100191, China;1. LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 53 rue des Martyrs, 38026 Grenoble, France;2. Univ. Grenoble Alpes, F-38000 Grenoble, France;3. CNRS, Inst NEEL, F-38000 Grenoble, France;4. Valeo Thermal Systems, 8 rue Louis Lormand, BP 517 La Verrière, 78321 Le Mesnil Saint Denis Cedex, France;5. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA;1. Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Köln, Germany;2. Institute for Inorganic and Analytical Chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, Germany;1. Univ. Bordeaux, ICMCB, UPR 9048, 33600 Pessac, France;2. Bordeaux INP, ICMCB, UPR 9048, 33600 Pessac, France;3. DRT/LITEN/DTNM/SERE/LTE, 38054 Grenoble, France;4. Institut Jean Lamour, UMR 7198, CNRS, France;1. LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 53 rue des Martyrs, 38026 Grenoble, France;2. CNRS, Inst NEEL, F-38000 Grenoble, France;3. Univ. Grenoble Alpes, F-38000 Grenoble, France;4. Valeo Thermal Systems, 8 rue Louis Lormand, BP 517 La Verrière, 78321 Le Mesnil Saint Denis Cedex, France;1. Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Köln, Germany;2. Institute for Inorganic and Analytical Chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, Germany |
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| Abstract: | The Sb-doped Mg2Ge compounds were successfully synthesized by tantalum-tube weld melting method followed by hot pressing and the thermoelectric properties were examined. The effects of Sb doping on the electrical conductivity, Seebeck coefficient, and thermal conductivity have been investigated in the temperature range of 300–740 K. It was found that the Sb doping with sufficient Mg excess increased the electrical conductivity dramatically, leading to enhancement of the power factors. The thermal conductivity was also reduced upon Sb doping, mainly due to mass fluctuation scattering and strain field effects. Mg2.2Ge0.095Sb0.005 showed a maximum thermoelectric figure of merit of ≈0.2 at 740 K. |
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| Keywords: | A Intermetallics B Thermoelectric properties G Thermoelectric power generation |
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