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A new vanadium oxide, potassium bis­(dioxovanad­yl) phosphate, β-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] and [VPO7] 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.

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Brannerite-type Li[VMoO6] has been synthesized by a solid state reaction route. The V and Mo atoms statistically occupy the same site with mirror symmetry and are octa­hedrally surrounded by O atoms. The framework is two-dimensional and is built up from edge-sharing (V,Mo)O6 octa­hedra forming (VMoO6) layers that run parallel to the (001) plane. Li+ ions are situated in position with symmetry 2/m in the inter­layer space. The bond-valence analysis reveals that the Li+ ionic conductivity is along the [010] and [110] directions, and shows that this material may have inter­esting conduction properties. This simulation proposes a model of the lithium conduction pathways.
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