Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure

Abstract Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that...

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Autores principales:	F. Serrano-Sánchez, M. Gharsallah, N. M. Nemes, N. Biskup, M. Varela, J. L. Martínez, M. T. Fernández-Díaz, J. A. Alonso
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d9906467f142480cb7b3ce54daabbaa5
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spelling	oai:doaj.org-article:d9906467f142480cb7b3ce54daabbaa52021-12-02T11:40:51ZEnhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure10.1038/s41598-017-05428-42045-2322https://doaj.org/article/d9906467f142480cb7b3ce54daabbaa52017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05428-4https://doaj.org/toc/2045-2322Abstract Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi0.35Sb1.65Te3. We provide a detailed structural analysis of the Bi2−xSbxTe3 series (0 ≤ x ≤ 2) based on neutron powder diffraction as a function of composition and temperature that reveals the important role played by atomic vibrations. Arc-melting produces layered platelets with less than 50 nm-thick sheets. The low thermal conductivity is attributed to the phonon scattering at the grain boundaries of the nanosheets. This is a fast and cost-effective production method of highly efficient thermoelectric materials.F. Serrano-SánchezM. GharsallahN. M. NemesN. BiskupM. VarelaJ. L. MartínezM. T. Fernández-DíazJ. A. AlonsoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q F. Serrano-Sánchez M. Gharsallah N. M. Nemes N. Biskup M. Varela J. L. Martínez M. T. Fernández-Díaz J. A. Alonso Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
description	Abstract Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi0.35Sb1.65Te3. We provide a detailed structural analysis of the Bi2−xSbxTe3 series (0 ≤ x ≤ 2) based on neutron powder diffraction as a function of composition and temperature that reveals the important role played by atomic vibrations. Arc-melting produces layered platelets with less than 50 nm-thick sheets. The low thermal conductivity is attributed to the phonon scattering at the grain boundaries of the nanosheets. This is a fast and cost-effective production method of highly efficient thermoelectric materials.
format	article
author	F. Serrano-Sánchez M. Gharsallah N. M. Nemes N. Biskup M. Varela J. L. Martínez M. T. Fernández-Díaz J. A. Alonso
author_facet	F. Serrano-Sánchez M. Gharsallah N. M. Nemes N. Biskup M. Varela J. L. Martínez M. T. Fernández-Díaz J. A. Alonso
author_sort	F. Serrano-Sánchez
title	Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
title_short	Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
title_full	Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
title_fullStr	Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
title_full_unstemmed	Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
title_sort	enhanced figure of merit in nanostructured (bi,sb)2te3 with optimized composition, prepared by a straightforward arc-melting procedure
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d9906467f142480cb7b3ce54daabbaa5
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Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure

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