High temperature thermoelectric properties of Yb14-xCaxMnSb11 made by reaction of the elements

Catherine A. Uvarov, Japheth F. Rauscher, Susan M. Kauzlarich

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The properties of the isovalent substitution of Ca2+ for Yb2+ will be presented for the Yb14-xCaxMnSb11 solid solution made by a direct reaction of elements (x = 0, 1, 2, 3, 4) with excess Mn (2×). Composition and phase purity was analyzed via powder X-ray diffraction. Electron microprobe analysis showed the presence of Mn inclusions. High temperature thermoelectric property measurements were performed including Seebeck, resistivity, and thermal conductivity (300-1300 K). While all the samples had impurities present, the Seebeck coefficients were enhanced, electrical resistivity was higher and showed a peak at approximately 800 K which may be attributed to Mn inclusions. The total thermal conductivity was lowered compared with Yb14MnSb11, as expected for replacing the heavier Yb2+ with the lighter Ca2+ cation. The maximum zT for the Yb14-xCaxMnSb11 system was observed for x = 2, reaching the value of 1 at 1200 K.

Original languageEnglish (US)
Pages (from-to)646-651
Number of pages6
JournalScience of Advanced Materials
Volume3
Issue number4
DOIs
StatePublished - Aug 2011

Keywords

  • 14-1-11
  • Antimonide
  • High zT
  • Power conversion
  • YbMnSb
  • Zintl

ASJC Scopus subject areas

  • Materials Science(all)

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