Abstract
Observed values of the c a ratios and of the atomic parameters of closepacked structures of intermetallic compounds having a composition XZ 3 and T-type order in the layers, are accounted for fairly accurately with the aid of a simple model involving short-range repulsive energy between nearest-neighbour atoms exclusively. The influence of the radius ratio of the constituent atoms on the stacking sequence of the layers in the compounds is also discussed with the aid of the model. In the Appendix, crystal structure data are given for the trialuminides XAl 3 ( X = La, Gd, Th, Y and Ho), and for Ce 3Al. The data were obtained by a least-squares refinement of powder X-ray diffraction data.
Published Version
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