The polygallides: Yb 3Ga 7Ge 3 and YbGa 4Ge 2

Sebastian C. Peter, Christos D. Malliakas, Heinze Nakotte, Karunakar Kothapilli, Sudhindra Rayaprol, Arthur J. Schultz, Mercouri G. Kanatzidis

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Abstract

Yb 3Ga 7Ge 3 and YbGa 4Ge 2 were obtained from reactions of Yb and Ge in excess liquid gallium. The crystal structure of Yb 3Ga 7Ge 3 was refined using X-ray and neutron diffraction data on selected single crystals. Yb 3Ga 7Ge 3 crystallizes in the monoclinic space group C2/c with lattice constants a=12.2261(20) Å, b=10.7447(20) Å, c=8.4754(17) Å and β=110.288(30)° (neutron diffraction data). The crystal structure of Yb 3Ga 7Ge 3 is an intergrowth of planar layers of YbGa xGe y and puckered layers of (Ge) n. YbGa 4Ge 2 crystallizes in a modified PuGa 6 structure type in the tetragonal polar space group I4cm with lattice constants a=b=5.9874(6) Å and c=15.1178(19) Å. The structure of YbGa 4Ge 2 is an intergrowth of puckered Ga layers and puckered Ga xGe y layers with Yb atoms residing within the channels formed by the connection of the two layers. Physical properties, resistivity (ρ), magnetic susceptibility (χ) and specific heat (C) were measured for Yb 3Ga 7Ge 3. No magnetic ordering was observed. It was found that at low temperatures, ρ varied as T 2 and C∝T, indicating Fermi-liquid regime in Yb 3Ga 7Ge 3 at low temperatures.

Original languageEnglish
Pages (from-to)200-207
Number of pages8
JournalJournal of Solid State Chemistry
Volume187
DOIs
Publication statusPublished - Mar 1 2012

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Keywords

  • Crystal structure
  • Intermetallics
  • Magnetism
  • Metal flux synthesis
  • Neutron diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Peter, S. C., Malliakas, C. D., Nakotte, H., Kothapilli, K., Rayaprol, S., Schultz, A. J., & Kanatzidis, M. G. (2012). The polygallides: Yb 3Ga 7Ge 3 and YbGa 4Ge 2. Journal of Solid State Chemistry, 187, 200-207. https://doi.org/10.1016/j.jssc.2012.01.006