K₂V₂O₂(AsO₄)₂

The vanadium oxide arsenate with formula K₂V₂O₂(AsO₄)₂, dipotassium divanadium(IV) dioxide diarsenate, has been synthesized by solid-state reaction in an evacuated silica ampoule. Its structure is isotypic with K₂V₂O₂(PO₄)₂. The framework is built up from corner-sharing VO₆ octa­hedra and AsO₄ tetra­hedra, creating an infinite [VAsO₈]_∞ chain running along the a- and c-axis directions. The K⁺ cations are located in hexa­gonal tunnels, which are delimited by the connection of the [VAsO₈]_∞ chains.