Ein [Ba(Ca,Mn)O6]-Gerüst mit eingelagerten V-O-V-Gruppen in der Kristallstruktur von Ba(Ca0.6Mn0.4)V2O7 /A [Ba(Ca,Mn)O6] Framework with Incorporated V-O-V Groups in the Crystal Structure of Ba(Ca0.6Mn0.4)V2O7

Abstract

Abstract Single crystals of Ba(Ca0.6Mn0.4)V2O7 have been prepared by crystallization from melts. X-ray investigations revealed a new quaternary vanadium oxide of the type BaMV2O7. The M positions are occupied statistically by Ca2+ and Mn2+. The compound crystallizes with orthorhombic symmetry, space group D2h 16-Pnma, a = 15.429(2), b - 5.7005(12), c = 7.364(2) Å, Z = 4. The crystal structure can be interpreted as a [Ba(Ca,Mn)O6] network with incorporated V-O- V groups. Considering the nearest O2- neighbours of the incorporated vanadium, the V-O-V groups are complemented to give V2O7 divanadate units. Ba(Ca0.6Mn0.4)V2O7 is isotypic to BaMV2O7 (M=Ca,Cd) but not to BaMnV2O7.