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On the ternary calcium-containing phases CaMxGa4−x (MPd, Pt, Cu, Ag, Au) with BaAl4 structure

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Grin, Y., Ellner, M., Predel, B., & Cordier, G. (1995). On the ternary calcium-containing phases CaMxGa4−x (MPd, Pt, Cu, Ag, Au) with BaAl4 structure. Journal of Alloys and Compounds, 216(2), 207-211. doi:10.1016/0925-8388(94)01281-L.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-90BF-3
The intermetallic compounds CaM(x)Ga(4-x) (M drop Pd, Pt, Cu, Ag, Au) were synthesized in order to investigate the stability of the BaAl4 structure type in ternary gallium-containing systems. The crystal structures have been studied on samples with the composition CaM(0.5)Ga(3.5), (M drop Cu, Au, Pd, Pt) by means of single-crystal and powder diffraction methods and have been found to be isotypic to BaGa4 and the homologous ytterbium compounds (BaAl4 structure type, space group I-4/mmm). In samples with this composition the transition metal atoms replace the gallium atoms in the sites with tetragonal antiprismatic environment. All phases obtained have homogeneity ranges with constant calcium content. The non-linear dependence of the unit cell parameters on composition can be explained by gallium-transition metal substitution in various positions. The GaM(x)Ga(4-x) compounds are diamagnetic in the temperature range 100-300 K.