Abstract
Abstract The five ternary intermetallic compounds M 2Pt6Al15 (M=Ca, Sc, Y, La, Lu) were prepared from the elements by arc-melting. The crystal structure was determined via single crystal X-ray diffraction. The title compounds crystallize in a superstructure of the RE 0.67Pt2Al5 type structure (P63/mmc) in the monoclinic crystal system with space group P121/m1 (Sc2Pt6Al15: a=734.19(2), b=1628.96(10), c=734.19(2) pm, β=119.999(3)°; wR=0.0356, 3034 F 2 values, 68 variables). The superstructure can be derived by the superspace formalism using (3+2)D or (3+1)D interpretations of the diffraction data. The structural relation to the subcell structure is discussed on the basis of a group-subgroup scheme. In the crystal structure strongly bonded [Pt2Al4] δ− slabs are alternatingly stacked with ordered layers containing M atoms and Al3 triangles.
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