Elastic properties and spectroscopic studies of lithium lead borate glasses

Elastic properties of xLi2O — 20PbO — (80-x)B2O3 glasses have been measured at a frequency of 10 MHz using X-cut and Y-cut quartz transducers. The trends in the variation of elastic moduli, Poisson’s ratio and Debye temperature have been studied. The elastic moduli namely longitudinal and young’s modulus show strong linear dependence while bulk and shear modulus vary marginally as a function of Li2O concentration. The Poisson’s ratio is found to be almost constant and Debye temperature increases with the increase of Li2O concentration. IR, MAS-NMR and glass transition temperature studies have been also carried out. Glass transition temperature is found to increase with increase of Li2O concentration. IR and MAS-NMR spectra show characteristic features of borate network and systematic change as a function of Li2O concentration. The variation in the elastic properties and structural features of IR and MAS-NMR indicate that Pb2+ ions are likely to occupy network forming positions in this glass system.