Abstract
A new vanadium oxide, potassium bis(dioxovanadyl) phosphate, beta-K(VO2)2(PO4), has been synthesized by a solid-state reaction. In the title compound, the [V2PO8] framework is built up from infinite pyramidal [V2O8]infinity and [VPO7]infinity chains linked together by V-O-P bridges, leading to a three-dimensional framework which delimits two types of intersecting tunnels running along [100] and [010] in which the four unique K+ ions, showing coordination numbers of nine and ten, are located.