Synthesis, structures and properties of CaGa, YGa and Y(Ga, Z) phases: A model for the transformation of a CrB to a MoB-type structure in doped YGa phases

Jing Tai Zhao, Dong Kyun Seo, John D. Corbett

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RGa compounds for R=Ca, Y and Y(Ga1-xZx) for Z=Cu or Zn have been synthesized by either arc-melting or direct reactions in sealed Ta containers. The CrB structures of the binary phases have been identified by Guinier powder diffraction, and the MoB-type structure of the new ternary line phase Y(Ga0.8Zn0.2) has been refined by single crystal means: I41/amd, Z=8, a=4.1787(5), c=21.856(4) Å, R(F)/Rw=3.8/2.7%. A comparable compound is obtained for YGa0.8Cu0.2, but not for Z=Cd or for RGa(Zn) with R=Tb or Er. Resistivity and magnetic susceptibility measurements on the CrB-type CaGa and YGa demonstrate their metallic properties and the non-applicability of a literal Zintl phase assignment of oxidation states to the latter. A qualitative bonding model is developed for the transformation of CrB-type YGa into the MoB structure of Y(Ga0.8Zn0.2) in terms of interchain σ* interactions of the π-states on the separate chains.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - Feb 28 2002



  • Crystal structure
  • Intermetallics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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