Synthesis, structure and properties of the new rare-earth Zintl phase Yb 11GaSb 9

Svilen Bobev, Veronika Fritsch, Joe D. Thompson, John L. Sarrao, Bernhard Eck, Richard Dronskowski, Susan M. Kauzlarich

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37 Scopus citations

Abstract

A new rare-earth rich Zintl phase Yb 11GaSb 9 was synthesized by direct fusion of the corresponding elements, and large single crystals of the compound were obtained from high temperature flux synthesis. Its crystal structure was determined by single-crystal X-ray diffraction to be orthorhombic in the non-centrosymmetric space group Iba2 (No. 45), Z=4 (R1=3.24%, wR2=6.40%) with a=11.7257(12)Å, b=12.3204(13)Å, c=16.633(2)Å measured at 90(3) K. The structure belongs to the Ca 11InSb 9-type and can be viewed as built of isolated Sb 4-tetrahedra centered by Ga, Sb-dimers and isolated Sb anions, which are separated by Yb 2+ cations. Electron count according to the Zintl formalism suggests that the phase is electron-precise and charge-balanced, which is supported by the virtually temperature-independent magnetization for Yb 11GaSb 9. Electrical resistivity data from 2 to 400 K confirm that Yb 11GaSb 9 is a small band-gap semiconductor with room temperature resistivity ρ298=45.1mΩcm, and low-temperature resistivity at 2 K ρ2=1.9Ωcm. As such, Yb 11GaSb 9 and related compounds might be promising materials for thermoelectric applications, and currently, efforts to synthesize new members of this family and test their thermoelectric performance are under way.

Original languageEnglish (US)
Pages (from-to)1071-1079
Number of pages9
JournalJournal of Solid State Chemistry
Volume178
Issue number4
DOIs
StatePublished - Apr 2005

Keywords

  • Crystal structure
  • Dft-calculations
  • Heat capacity
  • Magnetic measurements
  • Rare-earth intermetallics
  • Yb GaSb
  • Zintl phase

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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    Bobev, S., Fritsch, V., Thompson, J. D., Sarrao, J. L., Eck, B., Dronskowski, R., & Kauzlarich, S. M. (2005). Synthesis, structure and properties of the new rare-earth Zintl phase Yb 11GaSb 9 Journal of Solid State Chemistry, 178(4), 1071-1079. https://doi.org/10.1016/j.jssc.2005.01.008