Structure of V2O5-P2O5 glasses by X-ray and neutron diffraction

► V=O bonds exists in all VOn of V2O5-P2O5 glasses with V in V(V) and V(IV) states. ► VO5 square pyramids are formed in the 50V2O5-50P2O5 glass. ► Mixtures of VO5 and VO4 pyramids exist for vitreous V2O5 and 73V2O5-27P2O5 glass.