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Single crystals of CaCu(VO)(PO 4 ) 2  (I) and CaCu 1.13 (VO)0.87(PO 4 ) 2  (II) have been prepared using solid state reactions in closed and evacuated quartz tubes. X-ray characterization led to orthorhombic symmetry, space group D 16  2h -Pnma, lattice constants a, b, c (I): 9.708( 1), 9.603( 1), 6.913(1) Å and (II); 9.700(1), 9.614(1), 6.896(1) Å, Z = 4. Strongly deformed CaO 8  cubes are connected by planar CuO 4  polygons or square VO 1+4  pyramids. Short V-O distances are features of VO 2+  groups. Two point positions are occupied in a disordered manner by Cu 2+  and VO 2+ . The replacement of Cu 2+  by VO 2+  at one position depends on the ratio VO 2+  : Cu 2+  at the neighbouring position, since otherwise there would be collisions of the apical oxygen atoms of neighbouring VO 1+4  pyramids.

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Zur Kenntnis eines Vanadyl-Oxocuprat-Phosphats CaCu(VO)(PO 4 ) 2  mit Cu 2+  auf Positionen der VO 2+ -Ionen und einer kupferreicheren Phase CaCu 1,13 (VO) 0,87 (PO 4 ) 2  / On an Vanadyl Oxocuprate Phosphate CaCu(VO)(PO 4 ) 2  Containing Cu 2+  at Positions of VO 2+  Ions and a Copper Rich Phase CaCu 1.13 (VO) 0.87 (PO 4 ) 2