Zur Kenntnis eines Vanadyl-Oxocuprat-Phosphats CaCu(VO)(PO4)2 mit Cu2+ auf Positionen der VO2+-Ionen und einer kupferreicheren Phase CaCu1,13(VO)0,87(PO4)2 / On an Vanadyl Oxocuprate Phosphate CaCu(VO)(PO4)2 Containing Cu2+ at Positions of VO2+ Ions and a Copper Rich Phase CaCu1.13(VO)0.87(PO4)2

Autor:	Hk. Müller-Buschbaum, S. Meyer
Rok vydání:	1998
Předmět:	Crystallography chemistry chemistry.chemical_element General Chemistry Crystal structure Copper
Zdroj:	Zeitschrift für Naturforschung B. 53:521-526
ISSN:	1865-7117 0932-0776
DOI:	10.1515/znb-1998-5-604
Popis:	Single crystals of CaCu(VO)(PO4)2 (I) and CaCu1.13(VO)0.87(PO4)2 (II) have been prepared using solid state reactions in closed and evacuated quartz tubes. X-ray characterization led to orthorhombic symmetry, space group D16 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 CaO8 cubes are connected by planar CuO4 polygons or square VO1+4 pyramids. Short V-O distances are features of VO2+ groups. Two point positions are occupied in a disordered manner by Cu2+ and VO2+. The replacement of Cu2+ by VO2+ at one position depends on the ratio VO2+ : Cu2+ at the neighbouring position, since otherwise there would be collisions of the apical oxygen atoms of neighbouring VO1+4 pyramids.
Databáze:	OpenAIRE
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