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We present a corroborative study of structural characterization of lithiumsubstituted barium vanadate glasses using Raman and Electron ParamagneticResonance (EPR) spectroscopy. Investigation of the thermal and physicalproperties of these glasses showed a gradual increase in the concentration ofnon-bridging oxygen. Raman and EPR analysis gave an insight into the changingstructure of the glasses. Both the spectroscopic techniques confirmed thatvanadium is present in the glasses as distorted VO6 octahedra. From theanalysis of both spectroscopic techniques, it is proposed that the lithium ionprefers to occupy planar positions of the VO6 octahedra thus reducing thetetragonal distortion and making the environment around the network formingunit in the glass matrix more homogenous as we increase lithium content. Theconcentration of V4+ showed a non-monotonic variation with an increase in Li2Oas indicated by Raman studies and confirmed by EPR which indicates a structuralchange in the distorted VO6 octahedra.

A short-range structural insight into lithium substituted barium vanadate glasses using Raman and EPR spectroscopy as probes