Effect of Ca doping on the thermoelectric performance of Yb 14MnSb 11

Catherine A. Cox, Shawna R. Brown, G. Jeffrey Snyder, Susan M. Kauzlarich

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Complex Zintl phases possess low thermal conductivity and can be easily doped to modify the transport properties. Therefore, these phases have the potential to be good thermoelectric materials by simply controlling carrier concentration. Yb 14MnSb 11 is a Zintl phase that has shown promise as a p-type thermoelectric material for high-temperature power generation. A Sn-flux synthetic route was used to make the new phase, Yb 13CaMnSb 11. The high-temperature thermoelectric properties were measured on polycrystalline hot-pressed pellets and compared with Yb 14MnSb 11. Substitution of the lighter isovalent Ca for Yb should reduce the lattice thermal conductivity by mass disorder scattering, and a noticeable reduction is seen in thermal diffusivity measurements at high temperature. There may also be a carrier concentration effect by employing the more electropositive Ca.

Original languageEnglish (US)
Pages (from-to)1373-1375
Number of pages3
JournalJournal of Electronic Materials
Volume39
Issue number9
DOIs
StatePublished - Sep 2010

Keywords

  • Ca dopant
  • high zT
  • high-temperature thermoelectric
  • intermetallic
  • semiconductor
  • Yb14MnSb11
  • Zintl
  • zT = 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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