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The CaAg 2 —CaZn 2 —CaAl 2  pseudo ternary system has been studied by micrographic and X-ray diffraction analyses of 37 alloys, melted and annealed at 973 K or 873 K in tantalum crucibles. Single crystal and powder X-ray data show a distribution of the phases among four structure types: MgCu 2 , MgZn 2 , MgNi 2  (the Laves phases) and CeCu 2  (for the first time reported for KHg 2 ). A good separation of the structural domains was obtained by means of a two-dimensional map based on the size and electronic factors. The different volume effects shown by the CeCu 2 -type phases as regards those of the Laves phases were accounted for on the basis of the hard-sphere space filling model.

The CaAg 2 —CaZn 2 —CaAl 2 pseudo ternary system: crystal structures and structural stability