Spectroscopic studies on Li2O-MgO-Bi2O3-B2O3 glasses

MgO-Li2O-Bi2O3-B2O3 glasses were prepared by melt quench technique and analyzed with the help of refractive index, optical, IR, and Raman spectroscopy studies. The present glasses exhibited the mixed modifier effect (MME) through refractive index change non-linearly. The variation in the indirect optical band gap and band tailing in MgO content have been discussed with the glass structure. Based on the obtained values of alpha(o2-), optical basicity, and interaction parameters, the present glasses were termed as very semi covalent acidic oxide glasses. Raman and Infrared spectra reveal that these glasses are built up of BO3, BO4 units of B2O3 and octahedral [BiO6], pyramidal [BiO3] units of Bi2O3 were observed.