Synthesis and characterization of γ-irradiated cadmium-borate glasses doped V2O5

Abstract

In this work, we study the relationship between the optical and magnetic properties for the irradiated and unirradiated V2O5-doped cadmium borate glasses and examined their optical band energy that has compromise of non-bridging oxygen (NBO) and bridging oxygen (BO), V3+, V4+ and V5+, and BO3 units and BO4 units. The induced defects created by γ-rays were characterized by optical and EPR spectroscopy. The dependability of the defects and the tendency for recombination or conversion of the defects besides the environment of optically dynamic V centers was also discussed. It is concluded that the development of both optical and magnetic intensity is related to V4+ ions at tetrahedral sites whereas the decrease in their intensity is recognized to the ligand-metal charge transfer transitions of V4+ ions coupled to V5+. The optical band gap energy (Eg) has been observed to decrease with increasing either V2O5 content or γ-doses. High γ-dose reduces the values of the allowed direct optical band gap Eg of 0.5Mol% V2O5 glass up to 45kGy after which Eg increases, but remain lower than that of un-irradiated glass. Borate glasses under this study showed linear optical absorption response over the dose range of 5–80kG. Fading under dark and room light in 2h after exposure in the course of 30days have been studied in detail and presented. Our results and findings indicate that, the investigated samples may be seemed to be a good candidate for radiation processing purposes.