Abstract
The influence of γ-ray irradiation on the optical and structural properties of BaF2– Bi2O3–SiO2 glasses has been studied. The absorption spectra of respective glasses are found to shift to higher wavenumber side as dosage rate of gamma irradiation increases. This is because of the formation of non-bridging oxygen hole centers (NBOHC) and electrons due to ionizing power of BaF2. The optical band gap value decreases from 3.07 to 2.61eV with an increase in dosage rate as well as alkaline content. The Urbach energy of glasses increases due to gamma irradiation may be attributed to formation of non-bridging oxygen in the system. The electron paramagnetic resonance (EPR) spectra exhibit resonance signals at g = 4.17 and g = 2.17 due to triplet hole pairs localized on apical oxygens. There were no significant variations in Raman spectra and this may be due to high content of Bismuth that is known for shielding of gamma irradiation. Photoluminescence (PL) studies reveal that both pure and irradiated barium silicate glasses exhibit white light where red region is predominant than blue in irradiated glasses.
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