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BaO–Ga2O3–P2O5 glasses containing different concentrations of MoO3 ranging from 0 to 0.5 mol% have been prepared. Spectroscopic studies viz., infrared, optical absorption and ESR spectra of these glasses have been carried out as a function of molybdenum ion concentration. The results suggest that molybdenum ions exist in Mo5+ state with Mo(V)O3− complexes that act as modifiers in addition to Mo6+...