Abstract
Tungsten-doped sodium phosphate glasses of various compositions and with varying WO 3 contents were prepared. UV–visible and infrared spectroscopic studies were measured before and after successive gamma irradiation. Raman and ESR studies were conducted for some selected glass samples. Experimental results indicate that tungsten ions occupy two possible valences W 6+ and W 5+ with different local sites depending on the host glass composition and concentration of tungsten ions. The changes in UV, visible, infrared and Raman spectral data are discussed in relation to the structural evolution caused by the change in glass composition and state of tungsten ions. Electron spin resonance studies confirm the presence of unpaired W 5+ ions. Tungsten ions have been found to show a shielding behavior towards the effects of progressive gamma irradiation causing a retardation of the growth of the induced defects caused by irradiation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
