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The five ternary intermetallic compounds  M  2 Pt 6 Al 15  ( 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  0.67 Pt 2 Al 5  type structure ( P 6 3 / mmc ) in the monoclinic crystal system with space group  P 12 1 / m 1 (Sc 2 Pt 6 Al 15 :  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 [Pt 2 Al 4 ]  δ −  slabs are alternatingly stacked with ordered layers containing  M  atoms and Al 3  triangles.

The monoclinic superstructure of the M 2 Pt 6 Al 15 series ( M =Ca, Sc, Y, La, Lu)