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Title: Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg

Abstract

Here, the thermoelectric performance of Mg3+xSb1.5Bi0.49Te0.01 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 x from 0.2 to 0.01 in Mg3+xSb1.5Bi0.49Te0.01, 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. Lastly, it is known that excess Mg is required to make n-type Mg3+xSb1.5Bi0.49Te0.01; however, too much excess Mg in the material increases the thermal conductivity and is therefore detrimental for the overall thermoelectric performance of the material.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Northwestern Univ., Evanston, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1470445
Alternate Identifier(s):
OSTI ID: 1417526
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solar (photovoltaic); solar (thermal); solid state lighting; phonons; thermal conductivity; thermoelectric; defects; mechanical behavior; charge transport; spin dynamics; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, and Snyder, G. Jeffrey. Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg. United States: N. p., 2018. Web. doi:10.1063/1.5011379.
Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, & Snyder, G. Jeffrey. Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg. United States. doi:10.1063/1.5011379.
Imasato, Kazuki, Ohno, Saneyuki, Kang, Stephen Dongmin, and Snyder, G. Jeffrey. Fri . "Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg". United States. doi:10.1063/1.5011379. https://www.osti.gov/servlets/purl/1470445.
@article{osti_1470445,
title = {Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg},
author = {Imasato, Kazuki and Ohno, Saneyuki and Kang, Stephen Dongmin and Snyder, G. Jeffrey},
abstractNote = {Here, the thermoelectric performance of Mg3+xSb1.5Bi0.49Te0.01 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 x from 0.2 to 0.01 in Mg3+xSb1.5Bi0.49Te0.01, 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. Lastly, it is known that excess Mg is required to make n-type Mg3+xSb1.5Bi0.49Te0.01; however, too much excess Mg in the material increases the thermal conductivity and is therefore detrimental for the overall thermoelectric performance of the material.},
doi = {10.1063/1.5011379},
journal = {APL Materials},
number = 1,
volume = 6,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
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Cited by: 5 works
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Figures / Tables:

FIG. 1. FIG. 1. : Transport properties of Mg3+xSb1.5Bi0.49Te0.01 (x = 0.01-0.2) as a function of temperature: (a) Seebeck coefficient; (b) total thermal conductivity; (c) electrical conductivity; (d) figure-of-merit. While the electronic properties remain similar, the total thermal conductivity becomes smaller as less Mg (nominal composition) is used which leads to amore » higher zT value. The error bars indicate the following: for the Seebeck coefficient, the estimated range of underestimation due to the twoprobe configuration26 combined with observed sample variation; for the thermal conductivity, thickness uncertainty combined with instrument accuracy which is to be compared with sample-to-sample variation; for conductivity, thickness uncertainty combined with probe error estimation27 and sample variation.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.