Stacking variants of SrPtSb and CaAl2Si2 analogous units

Structure determinations on the basis of single crystal X-ray methods revea led, that the crystal structures of Ca3Cu2Zn2P4 (P (3) over bar m1; Z = 1; a =4.034(1), c = 14.604(3) Angstrom), the isotypic Eu compound (a = 4.150(9 ), c = 15.210(7) Angstrom), of Ca2CuZn2P3 (P6(3)/mmc; Z = 2; a = 4.048(2), c = 21.466(11) Angstrom) and Ca4Cu3Zn2P5 (P6(3)/mmc; Z=2; a=4.041(1), c= 37 .060(7) Angstrom) respectively can be described as stacking variants built up by two different segments. The first one corresponds with the hexagonal SrPtSb structure type, the second one with the trigonal CaAl2Si2 structure type. The segments along [001] are arranged one another and are represented with different weightiness in the compounds concerned.