Composition and the thermoelectric performance of β-Zn 4Sb3

Eric S. Toberer, Protima Rauwel, Sylvain Gariel, J. Taftø, G. Jeffrey Snyder

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

β-Zn4Sb3 is a promising thermoelectric material due to the abundance of zinc and antimony and reports of high efficiency in bulk samples. This work establishes the high temperature properties of β-Zn4Sb3 across the phase stability window. By controlling the stoichiometry, the Hall carrier concentration can be tuned from 6-9 × 1019 cm-3 without requiring extrinsic dopants. The trend in Seebeck coefficient on carrier concentration is rationalized with a single, parabolic band model. Extremely low lattice thermal conductivity (0.4-0.6 W m-1 K-1) coupled with a moderate effective mass (1.2 me) and mobility leads to a large figure of merit (zT of 0.8 by 550 K). The single parabolic band model is used to obtain the carrier concentration dependence of the figure of merit and an optimum carrier concentration near 5 × 1019 cm-3 is predicted.

Original languageEnglish (US)
Pages (from-to)9877-9885
Number of pages9
JournalJournal of Materials Chemistry
Volume20
Issue number44
DOIs
StatePublished - Nov 28 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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