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Thermoelectric Properties of Sb-Doped Mg2Si0.3Sn0.7

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Abstract

Mg2(Si0.3Sn0.7)1−y Sb y (0 ≤ y ≤ 0.04) solid solutions were prepared by a two-step solid-state reaction method combined with the spark plasma sintering technique. Investigations indicate that the Sb doping amount has a significant impact on the thermoelectric properties of Mg2(Si0.3Sn0.7)1−y Sb y compounds. As the Sb fraction y increases, the electron concentration and electrical conductivity of Mg2(Si0.3Sn0.7)1−y Sb y first increase and then decrease, and both reach their highest value at y = 0.025. The sample with y = 0.025, possessing the highest electrical conductivity and one of the higher Seebeck coefficient values among all the samples, has the highest power factor, being 3.45 mW m−1 K−2 to 3.69 mW m−1 K−2 in the temperature range of 300 K to 660 K. Meanwhile, Sb doping can significantly reduce the lattice thermal conductivity (κ ph) of Mg2(Si0.3Sn0.7)1−y Sb y due to increased point defect scattering, and κ ph for Sb-doped samples is 10% to 20% lower than that of the nondoped sample for 300 K < T < 400 K. Mg2(Si0.3Sn0.7)0.975Sb0.025 possesses the highest power factor and one of the lower κ ph values among all the samples, and reaches the highest ZT value: 1.0 at 640 K.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Wei Liu, Qiang Zhang, Xinfeng Tang & Han Li

  2. Marlow Industries, Inc., 10465 Vista Park Road, Dallas, TX, 75238-1645, USA

    Jeff Sharp

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  1. Wei Liu
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  2. Qiang Zhang
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  3. Xinfeng Tang
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  4. Han Li
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Correspondence to Xinfeng Tang.

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Liu, W., Zhang, Q., Tang, X. et al. Thermoelectric Properties of Sb-Doped Mg2Si0.3Sn0.7 . J. Electron. Mater. 40, 1062–1066 (2011). https://doi.org/10.1007/s11664-011-1541-0

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  • DOI: https://doi.org/10.1007/s11664-011-1541-0

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