Lithium insertion reactions of monophosphate tungsten bronzes, (PO2)4(WO3)2m and diphosphate tungsten bronzes K(P2O4)2(WO3)2m indicate that a maximum of two Li/W and one Na/W may be inserted in these materials. The phosphate tungsten bronzes are three-dimensional network structures made up of slabs of ReO3-type WO6 octahedra connected by phosphate groups with large interconnected cavities. Ion-exchange reactions of selected members of K(P2O4)2(WO3)2m show that potassium which occupies the large hexagonal tunnels in the lattice may be exchanged for various alkali metal cations. Upon lithium insertion, the metallic host materials become insulating. This is attributed to the filling of the π* conduction band formed by the overlap of Wt2g - 5d and oxygenπ - 2p orbitals.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry