Barium divanadium(V) tellurite(IV).

A new three-dimensional bimetallic tellurite, BaV2TeO8, was synthesized by the hydrothermal reaction of Ba(OH)2, TeO2 and V2O5, and characterized by single-crystal X-ray diffraction. The three-dimensional framework is built up from anionic [V2TeO8]n(2n-) layers parallel to (101) and connected via Ba-O bonds. The anionic layers are formed by three types of polyhedra, namely VO5 tetragonal pyramids, VO(4) tetrahedra and TeO(4+2) 'folded square' polyhedra.