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Unusual consequences of donor and acceptor doping to thermoelectric properties of half-Heusler MgAg0.97Sb0.99 alloys

Abstract

MgAgSb compound has been demonstrated to be one of the two best low-temperature thermoelectric materials. In this work, a series of dopants to MgAg0.97Sb0.99 alloys were studied in order to explore the consequences of them on the power factor (PF) and thermoelectric figure-of-merit (ZT). The systematic study revealed that, starting from the slightly Ag and Sb-deficient MgAg0.97Sb0.99 alloy, the donor dopant degraded both the PF and ZT, while the acceptor dopant enhanced the PF without affecting the ZT. Both donor and acceptor made the total thermal conductivity larger. A full-scale thermoelectric computation based on the first-principles calculations and the Boltzmann transport theory was carried out to validate the experimental results. The calculated results on the donors and acceptors were semi-quantitatively consistent with our experiments. The present work suggests that the carrier doping alone may not be sufficient to significantly improve the overall thermoelectric performance of MgAg0.97Sb0.99 alloy.

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Publication details

The article was received on 30 Sep 2017, accepted on 05 Jan 2018 and first published on 05 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08657A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Unusual consequences of donor and acceptor doping to thermoelectric properties of half-Heusler MgAg0.97Sb0.99 alloys

    Y. Liu, D. Zhou, Y. Li, A. Hong, J. Sui, J. Liu and Z. Ren, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08657A

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