BaMn9II(VO4)6(OH)2: a homospin ferrimagnet with a broken spinel-lattice of B-sites†
Abstract
A new vanadate of BaMn9II(VO4)6(OH)2 was synthesized by a conventional hydrothermal method. BaMn9II(VO4)6(OH)2 crystallizes in the cubic space group Pa, which exhibits an edge-sharing MnO6 octahedral network structure with cavities occupied by Ba(VO4)616− groups. The lattice built by Mn2+ ions shows the reverse triangular dipyramid Mn7 in the system, which can be considered as a broken spin lattice of B-sites in spinels. The title compound shows a ferrimagnetic behavior with TC = 18 K.