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

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

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
Volume22
Issue number3
DOIs
StatePublished - Feb 9 2010

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'High-temperature transport properties of the Zintl phases Yb <sub>11</sub>GaSb<sub>9</sub> and Yb<sub>11</sub>InSb<sub>9</sub>'. Together they form a unique fingerprint.

  • Cite this

    Yi, T., Cox, C. A., Toberer, E. S., Snyder, G. J., & Kauzlarich, S. M. (2010). High-temperature transport properties of the Zintl phases Yb 11GaSb9 and Yb11InSb9 Chemistry of Materials, 22(3), 935-941. https://doi.org/10.1021/cm901824c