Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping

Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping

Abstract We report the enhanced thermoelectric properties of Ce-doped AgSbTe2 (AgSb1−xCexTe2) compounds. As the Ce contents increased, the proportion of heterophase Ag2Te in the AgSbTe2 gradually decreased, along with the size of the crystals. The electrical resistivity and Seebeck coefficient were...

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Main Authors: Jae Ki Lee, Min-Wook Oh, Byungki Ryu, Ji Eun Lee, Bong-Seo Kim, Bok-Ki Min, Sung-Jae Joo, Hee-Woong Lee, Su-Dong Park
Format: Article
Language:English
Published: Nature Publishing Group 2017-07-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-017-04885-1
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spelling doaj-cbc70153314e41f8a746ac35c10a35a32020-12-08T00:47:23ZengNature Publishing GroupScientific Reports2045-23222017-07-01711810.1038/s41598-017-04885-1Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce dopingJae Ki Lee0Min-Wook Oh1Byungki Ryu2Ji Eun Lee3Bong-Seo Kim4Bok-Ki Min5Sung-Jae Joo6Hee-Woong Lee7Su-Dong Park8Institute for Metallic Materials, Leibniz Institute for Solid State and Materials ResearchDepartment of Advanced Materials Engineering, Hanbat National UniversityThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteThermoelectric Conversion Research Center, Korea Electrotechnology Research InstituteAbstract We report the enhanced thermoelectric properties of Ce-doped AgSbTe2 (AgSb1−xCexTe2) compounds. As the Ce contents increased, the proportion of heterophase Ag2Te in the AgSbTe2 gradually decreased, along with the size of the crystals. The electrical resistivity and Seebeck coefficient were dramatically affected by Ce doping and the lattice thermal conductivity was reduced. The presence of nanostructured Ag2Te heterophases resulted in a greatly enhanced dimensionless figure of merit, ZT of 1.5 at 673 K. These findings highlight the importance of the heterophase and doping control, which determines both electrical and thermal properties.https://doi.org/10.1038/s41598-017-04885-1
collection DOAJ
language English
format Article
sources DOAJ
author Jae Ki Lee
Min-Wook Oh
Byungki Ryu
Ji Eun Lee
Bong-Seo Kim
Bok-Ki Min
Sung-Jae Joo
Hee-Woong Lee
Su-Dong Park
spellingShingle Jae Ki Lee
Min-Wook Oh
Byungki Ryu
Ji Eun Lee
Bong-Seo Kim
Bok-Ki Min
Sung-Jae Joo
Hee-Woong Lee
Su-Dong Park
Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
Scientific Reports
author_facet Jae Ki Lee
Min-Wook Oh
Byungki Ryu
Ji Eun Lee
Bong-Seo Kim
Bok-Ki Min
Sung-Jae Joo
Hee-Woong Lee
Su-Dong Park
author_sort Jae Ki Lee
title Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
title_short Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
title_full Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
title_fullStr Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
title_full_unstemmed Enhanced thermoelectric properties of AgSbTe2 obtained by controlling heterophases with Ce doping
title_sort enhanced thermoelectric properties of agsbte2 obtained by controlling heterophases with ce doping
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2017-07-01
description Abstract We report the enhanced thermoelectric properties of Ce-doped AgSbTe2 (AgSb1−xCexTe2) compounds. As the Ce contents increased, the proportion of heterophase Ag2Te in the AgSbTe2 gradually decreased, along with the size of the crystals. The electrical resistivity and Seebeck coefficient were dramatically affected by Ce doping and the lattice thermal conductivity was reduced. The presence of nanostructured Ag2Te heterophases resulted in a greatly enhanced dimensionless figure of merit, ZT of 1.5 at 673 K. These findings highlight the importance of the heterophase and doping control, which determines both electrical and thermal properties.
url https://doi.org/10.1038/s41598-017-04885-1
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