Influence of Ag2O on some physical properties of LiF–TiO2–P2O5 glass system

LiF-TiO2-P2O5 glasses mixed with different concentrations of Ag2O (ranging from 0 to 1.5 mol%) were prepared. The samples were characterized by X-ray diffraction, scanning electron microscopy. The optical absorption and ESR spectral studies of these glasses have indicated that the titanium ions exist in Ti3+ state in addition to Ti4+ state in these samples. The IR spectral studies exhibit bands due to TiO4 and TiO6 structural units in addition to the conventional bands due to various phosphate structural groups. From the studies it is observed that the degree of disorder in the glass network increases with the increase in the concentration of Ag2O from 0 to 1.0 mol%. Studies on dielectric properties of these glasses over a range of frequency and temperature have also been carried out. These studies have indicated that as the concentration of Ag2O is increased up to 1.0 mol%, the insulating strength of the glasses decreases where as the rigidity of the glasses seems to increase when the concentration of Ag2O is raised from 1.0 to 1.5 mol%. The a.c. conductivity seems to be predominantly ionic in nature in the glass samples containing Ag2O UP to 1.0 mol%. (C) 2009 Elsevier B.V. All rights reserved.