Gamma ray interaction with sodium phosphate glasses containing MoO3

Abstract

Sodium metaphosphate glasses undoped and doped with varying MoO3 contents were prepared and their UV–visible, infrared and Raman spectroscopy were measured. The ultraviolet–visible absorption were remeasured after each successive gamma irradiation. The induced color centers of the intrinsic defects of the undoped and extrinsic defects due to Mo-doped glasses were characterized. The structural forming units were derived and analyzed from infrared and Raman spectroscopic evolution. Also, some sodium phosphate glasses with varying Na2O or P2O5 content and constant MoO3 were investigated. The experimental results show that the parent undoped sodium metaphosphate reveals strong ultraviolet spectra originating from the presence of trace iron impurities. Upon gamma irradiation, some UV and visible induced absorption bands are resolved which can be correlated with POHC, OHC, PEC from phosphate network and extrinsic defect due to iron impurities. The high Mo-doped glass reveals two small visible bands with increasing the Na2O content which seems to be related to polymolybdate ions. Infrared and Raman spectra show the characteristic absorption bands due mainly to metaphosphate network and molybdate groups.