Characterization of Pr6O11-Ag2O-B2O3 Glasses.

Silver borate glasses doped with Praseodymium of different concentration has been prepared by melt quench technique. X-ray diffraction pattern shows that there is no sharp peak it confirms the amorphous nature of the present glasses. The glass transition temperature (Tg) of this glass system have been studied using the Matac MBS-8000 Digital Signal Processing and Conventional Thermal Analysis (DTA) method. The Tg of these glasses increases with increase in concentration of Pr6O11 except at 0.2 mol%Tg value is lower. We investigate the network structure of Pr6O11-Ag2O-B2O3 glass by 11B magic angle spinning (MAS)-nuclear magnetic resonance (NMR) which shows the presence of sharp peak at around 18 ppm. Formation of B4 units is assumed to be occurring initially through the formation of oxygen bridges between [BO3/2] 0 units in B2O3.