Optical absorption and IR studies on 25Bi2O3-(75 − x)B2O3-xBaO (0 ≤ x ≤ 25) glasses

Glasses with composition 25Bi2O3-(75 − x)B2O3-xBaO, (0 ≤ x ≤ 25) have been prepared using melt quench technique. Optical absorption spectra of the glasses revealed that the cutoff wavelength increases and optical band gap energy decreased with increased in BaO content. The Eopt values of these glasses are found to be in the range 2.72–3.15 eV where as the value of ΔE lies in the range 0.45–0.27 eV. The polarizability of oxygen ions in these glasses is determined using optical absorption data. Theoretical basicity of the glasses is also evaluated by standard formula. Infrared studies revealed that the glasses under present study are made up of [BO3], [BO4] and [BiO6] units.