Impact effects of gamma irradiation on the optical and FT infrared absorption spectra of some Nd3+–doped soda lime phosphate glasses

Abstract

The main aim of the present work is to study by two collective optical and FTIR spectral measurements some prepared Nd2O3–doped soda lime phosphate glasses before and after gamma irradiation with dose (9 Mrad). The spectral data reveal two strong UV absorption peaks which are correlated with unavoidable trace iron impurities beside extended additional characteristic bands due to Nd3+ ions. Gamma irradiation on the undoped glass produces slight decrease of the intensity of the UV absorption and the generation of an induced visible band and these effects are controlled with two photochemical reduction of some Fe3+ ions to Fe2+ ions together with the formation of nonbridging oxygen hole center (NBOHC) or phosphorous oxygen hole center (POHC). The impact effect of gamma irradiation on the spectra of Nd2O3–doped glasses is limited due to suggested shielding behavior of neodymium ions. FT–infrared spectra show vibrational modes due to main Q2–Q3 phosphate groups and the response of gamma irradiation of the IR spectra is low and the limited variations are related to suggested changes in some bond angles and bond lengths which cause the observed decrease to the intensities of some IR bands.