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

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

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% improveme...

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Main Authors: Kazuki Imasato, Saneyuki Ohno, Stephen Dongmin Kang, G. Jeffrey Snyder
Format: Article
Language:English
Published: AIP Publishing LLC 2018-01-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.5011379
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spelling doaj-d5aa5b79151a4354b6edc898bad3092a2020-11-24T21:32:41ZengAIP Publishing LLCAPL Materials2166-532X2018-01-0161016106016106-510.1063/1.5011379006801APMImproving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess MgKazuki Imasato0Saneyuki Ohno1Stephen Dongmin Kang2G. Jeffrey Snyder3Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USADepartment of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USADepartment of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USADepartment of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USAThe 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. 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.http://dx.doi.org/10.1063/1.5011379
collection DOAJ
language English
format Article
sources DOAJ
author Kazuki Imasato
Saneyuki Ohno
Stephen Dongmin Kang
G. Jeffrey Snyder
spellingShingle Kazuki Imasato
Saneyuki Ohno
Stephen Dongmin Kang
G. Jeffrey Snyder
Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
APL Materials
author_facet Kazuki Imasato
Saneyuki Ohno
Stephen Dongmin Kang
G. Jeffrey Snyder
author_sort Kazuki Imasato
title Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
title_short Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
title_full Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
title_fullStr Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
title_full_unstemmed Improving the thermoelectric performance in Mg3+xSb1.5Bi0.49Te0.01 by reducing excess Mg
title_sort improving the thermoelectric performance in mg3+xsb1.5bi0.49te0.01 by reducing excess mg
publisher AIP Publishing LLC
series APL Materials
issn 2166-532X
publishDate 2018-01-01
description 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. 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.
url http://dx.doi.org/10.1063/1.5011379
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AT saneyukiohno improvingthethermoelectricperformanceinmg3xsb15bi049te001byreducingexcessmg
AT stephendongminkang improvingthethermoelectricperformanceinmg3xsb15bi049te001byreducingexcessmg
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