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Published January 2018 | Published + Supplemental Material
Journal Article Open

Improving the thermoelectric performance in Mg_(3+x)Sb_(1.5)Bi_(0.49)Te_(0.01) by reducing excess Mg

Abstract

The thermoelectric performance of Mg_(3+x)Sb_(1.5)Bi_(0.49)Te_(0.01) was improved by reducing the amount of excess Mg (x = 0.01-0.2). A 20% reduction in effective lattice thermal conductivity at 600 K was observed by decreasing the nominal xfrom 0.2 to 0.01 in Mg_(3+x)Sb_(1.5)Bi_(0.49)Te_(0.01), leading to a 20% improvement in the figure-of-merit zT. Since materials with different amounts of Mg have similar electronic properties, the enhancement is attributed primarily to the reduction in thermal conductivity. It is known that excess Mg is required to make n-type Mg_(3+x)Sb_(1.5)Bi_(0.49)Te_(0.01); however, too much excess Mg in the material increases the thermal conductivity and is therefore detrimental for the overall thermoelectric performance of the material.

Additional Information

© 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received 31 October 2017; accepted 5 January 2018; published online 19 January 2018. The authors would like to thank Dr. Hiromasa Tamaki and Dr. Tsutomu Kanno from Panasonic for valuable discussions. This work was supported by the NASA Science Mission Directorate's Radioisotope Power Systems Thermoelectric Technology Development and the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0001299. K.I. acknowledges support from Funai Foundation for Information Technology.

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August 21, 2023
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