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Single crystals of ra-Mg 2 CuV 2 O 8  (I) and MgCu 2 V 2 O 8  (II) have been prepared by solid state reactions. The orange (I) and dark red (II) crystals show monoclinic symmetry, space group C 5  2h  -P2 1 /c, (I): a = 6.167(3), b = 8.172(5), c = 6.400(8) Å, β = 116.22(3)°, Z = 2; (II): a = 6.453(1), b = 8.342(2), c = 11.517(2)Å,β 90.44(2), Z = 4. Both compounds show ordered metal distributions and vanadium in tetrahedral coordination by oxygen. (I) is characterized by elongated CuO 6  octahedra and (II) by trigonal CuO 5  bipyramids. m-Mg 2 CuV 2 O 8  is the low temperature form of the formerly investigated orthorhombic o-Mg 2 CuV 2 O 8 . Calculations of the Coulomb parts of the lattice energy of the two crystal forms are discussed

zeitschrift für naturforschung b

Zwei monokline Kupfer-Oxovanadate des Magnesiums mit geordneter Metallverteilung: m-Mg 2 CuV 2 O 8  und MgCu 2 V 2 O 8 . Ein Beitrag zur Dimorphie von Mg 2 CuV 2 O 8  / Two Monoclinic Copper Oxovanadates of Magnesium Showing Ordered Metal Distribution: m-Mg 2 CuV 2 O 8  and MgCu 2 V 2 O 8 . A Contribution on Dimorphism of Mg 2 CuV 2 O 8