You are here

Enhanced thermoelectric figure-of-merit in Bi-Sb-Te nanocomposites with homogenously dispersed oxide ceramic ZrO2 nanoparticles

TitleEnhanced thermoelectric figure-of-merit in Bi-Sb-Te nanocomposites with homogenously dispersed oxide ceramic ZrO2 nanoparticles
Publication TypeJournal Article
Year of Publication2017
AuthorsMadavali, B, Kim, HS, Lee, KH, Hong, SJ
JournalJournal of Applied Physics
Volume121
Pagination225104
Date Published06
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000403291200027
Keywordsalloys, composites, efficient, performance, physics
Abstract

In this research, p-type BiSbTe/ZrO2 nanocomposite powders were fabricated by high-energy ball milling. Different weight percentages of ZrO2 (2, 4, and 6wt. %) nanoparticles were incorporated into the bulk (BiSbTe) matrix by consolidation of as-synthesized nanocomposites (NCs) powder by spark plasma sintering at 673 K. The phase and existence of ZrO2 nano-inclusions was confirmed by X-ray diffraction and transmission electron microscopy-selected area electron diffraction analysis. The Seebeck coefficient of the BiSbTe/ZrO2 NCs was significantly improved (similar to 36% for 4 wt. % added NCs) by a decrease in the carrier concentration and energy filtering effect, whereas the thermal conductivity was much reduced via strong scattering of carriers/phonons. The peak thermoelectric figure-of-merit (1.34 +/- 0.06) was obtained for BiSbTe into which 2 wt. % ZrO2 was dispersed, which was approximately 20% greater than that of the undispersed sample. The hardness of the nanocomposites was significantly improved (similar to 27%) due to grain-boundary hardening and a dispersion strengthening mechanism. Published by AIP Publishing.

DOI10.1063/1.4984914
Custom 1

Not AL