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The crystal-chemical relationship of the cubic Laves phase MgCu 2  (space group  Fd3   ‾$d\overline{3}$m ,  cF 24) with the ternary phases Cd 2 Cu 3 In, Na 2 Au 3 Al, Mg 2 Rh 3 P, Li 2 Pd 3 B, Ag 2 Pd 3 S, Cu 3 Pt 2 B, Mo 3 Al 2 C, Mo 3 Ni 2 N, and V 3 Ga 2 N (subgroup  P 4 1 32,  cP 24,  dca ) is discussed based on a group-subgroup scheme. The course of the lattice parameters and the free positional parameters show substantially different distortions and thus clear differences in chemical bonding, classifying these phases as isopointal rather than isotypic (usually they are all assigned to the Mo 3 Al 2 C type). The group-subgroup scheme further shows that the  β -Mn and SrSi 2  structures are vacancy-ordered variants of the  cP 24,  dca  phases. The structures of Mn 3 IrSi and LaIrSi (space group types  P 2 1 3;  translationengleiche  subgroups) are their ternary ordered versions.

Isopointal intermetallics: the cP 24, dca phases as a representative set of examples, along with their vacancy-ordered variants β -Mn and SrSi 2