High-temperature transport properties of the Zintl phases Yb 11GaSb9 and Yb11InSb9

Tanghong Yi, Catherine A. Cox, Eric S. Toberer, G. Jeffrey Snyder, Susan M. Kauzlarich

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36 Scopus citations


Two rare-earth Zintl phases, Yb11GaSb9 and Yb 11InSb9, were synthesized in high-temperature self-fluxes of molten Ga and In, respectively. Structures were characterized by both single-crystal X-ray diffraction and powder X-ray diffraction and are consistent with the published orthorhombic structure, with the space group Iba2. High-temperature differential scanning calorimctry (DSC) and thermal gravimctry (TG) measurements reveal thermal stability to 1300 K. Secbeck coefficient and resistivity measurements to 1000 K are consistent with the hypothesis that Yb11GaSb9 and Yb11InSb9 are small band gap semiconductors or semimetals. Low doping levels lead to bipolar conduction at high temperature, preventing a detailed analysis of the transport properties. Thermal diffusivity measurements yield particularly low lattice thermal conductivity values, less than 0.6 W/m K for both compounds. The low lattice thermal conductivity suggests that Yb11MSb9 (M = Ga, In) has the potential for high thermoelectric efficiency at high temperature if charge-carrier doping can be controlled.

Original languageEnglish (US)
Pages (from-to)935-941
Number of pages7
JournalChemistry of Materials
Issue number3
StatePublished - Feb 9 2010

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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