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

Imasato, Kazuki and Ohno, Saneyuki and Kang, Stephen Dongmin and Snyder, G. Jeffrey (2018) Improving the thermoelectric performance in Mg_(3+x)Sb_(1.5)Bi_(0.49)Te_(0.01) by reducing excess Mg. APL Materials, 6 (1). Art. No. 016106. ISSN 2166-532X. http://resolver.caltech.edu/CaltechAUTHORS:20180119-104431079

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1063/1.5011379DOIArticle
http://aip.scitation.org/doi/10.1063/1.5011379PublisherArticle
ORCID:
AuthorORCID
Imasato, Kazuki0000-0001-7294-1780
Ohno, Saneyuki0000-0001-8192-996X
Kang, Stephen Dongmin0000-0002-7491-7933
Snyder, G. Jeffrey0000-0003-1414-8682
Alternate Title:Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
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.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Department of Energy (DOE)DE-SC0001299
Funai Foundation for Information TechnologyUNSPECIFIED
Subject Keywords:Thermal; Thermoelectric effects; Electrical conductivity; Speed; Semiconductors
Record Number:CaltechAUTHORS:20180119-104431079
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180119-104431079
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84417
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Jan 2018 21:34
Last Modified:19 Jan 2018 21:34

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