Optical absorption studies of γirradiated magnesium phosphate glasses

Abstract

The optical absorption is studied as a function of γ-irradiation dose and composition for a series of magnesium phosphate glasses. The optical absorption spectra were measured in the wavelength range from 200 to 1100 nm at different γ-doses in the range from 0.2 to 1.0 Mard. The obtained results are analysed assuming optical absorption by indirect transitions. Values of Λ₀ the absorption band edge wavelength, the optical energy gap and the width of the band tail (E_opt, and ΔE) are determined. They are found to be γ-irradiation dependent for γ-dose values up to 1.0 Mard. It was found from these parameters that the present glass system can be divided into two distinct compositional regions: below and above 35 mole % MgO.

Key Words:

• Optical absorption
• magnesium phosphate glasses
• gamma radiation.