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Enhanced Seebeck coefficient by energy filtering in Bi-Sb-Te based composites with dispersed Y2O3 nanoparticles

TitleEnhanced Seebeck coefficient by energy filtering in Bi-Sb-Te based composites with dispersed Y2O3 nanoparticles
Publication TypeJournal Article
Year of Publication2017
AuthorsMadavali, B, Kim, HS, Lee, KH, Hong, SJ
JournalIntermetallics
Volume82
Pagination68-75
Date Published03
Type of ArticleArticle
ISBN Number0966-9795
Accession NumberWOS:000399379100009
Keywords(bi,sb)(2)te-3, alloys, chemistry, energy, filtering, heterojunction potentials, high-thermoelectric performance, Materials Science, Metallurgical Engineering, nanocomposites, nanoinclusions, p-type Bi-Sb-Te nanocomposites, power, scattering, Seebeck coefficient, thermal-conductivity, thermoelectric materials, Time
Abstract

49%) compared to that of pure BiSbTe, and this was attributed to grain-boundary hardening and to a dispersion strengthening mechanism. The electrical conductivity decreased while the Seebeck coefficient significantly improved (45%) at room temperature for the NCs to which 2 wt% Y2O3 was added. This was due to the scattering of carriers through the energy filtering effect. The electronic component of the thermal conductivity greatly contributed to the reduction of total thermal conductivity (22%) in BiSbTe NCs to which 6 wt% Y2O3 was added. A peak ZT of 1.24 was achieved for BiSbTe/(2 wt%) Y2O3 NCs due to reduction in their thermal conductivity and improved Seebeck coefficient values. (C) 2016 Elsevier Ltd. All rights reserved.

DOI10.1016/j.intermet.2016.11.002
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Short TitleIntermetallics
Alternate JournalIntermetallics