Optical and infrared absorption of gamma irradiated ternary silicate glasses containing NiO

651-666<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">The optical and infrared absorption spectra of ternary silicate glasses containing NiO were studied systematically, as function of glass composition. The same properties were measured after successive gamma ray irradiation. The induced spectra and the rate of formation of the intrinsic defect of the base glass and the extrinsic detect due to the nickel ion were calculated. The experimental optical results were analysed and explained by assuming that, nickel exists in glass as divalent Ni ions in two different states of coordination, namely, octahedral and tetrahedral. The infrared spectra of the doped glasses reveal the same spectra of the undoped glasses retaining the main vibrational bands which indicate that the dopant oxide has no effect on the main structural building groups. The rates of formation and annihilation of the color centers produced by gamma irradiation are believed to approach saturation or equilibrium with prolonged irradiation. </span