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Marcella Pani, Maria L. Fornasini, Franco Merlo

The CaAg₂—CaZn₂—CaAl₂ pseudo ternary system: crystal structures and structural stability

Keywords: Calcium intermetallics, Laves phases, Structure maps, Volume effects, Single crystal structure analysis

The CaAg₂—CaZn₂—CaAl₂ 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: MgCu₂, MgZn₂, MgNi₂ (the Laves phases) and CeCu₂ (for the first time reported for KHg₂). 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 CeCu₂-type phases as regards those of the Laves phases were accounted for on the basis of the hard-sphere space filling model.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 05/2007
Pages: 218 - 225

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