Abstract
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 language | English (US) |
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Pages (from-to) | 110-117 |
Number of pages | 8 |
Journal | Journal of Alloys and Compounds |
Volume | 334 |
Issue number | 1-2 |
DOIs | |
State | Published - Feb 28 2002 |
Externally published | Yes |
Keywords
- Crystal structure
- Intermetallics
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry