Elastic properties of fast ion conducting lithium based borate glasses

Elastic properties of $Li_{2}O-PbO-B_{2}O_{3}$ glasses have been investigated using sound velocity measurements at 10 MHz. Four series of glasses have been investigated with different concentrations of $Li_{2}O$, PbO and $B_{2}O_{3}$. The variations of molar volume have been examined for the influences of $Li_{2}O$ and PbO. The elastic moduli reveal trends in their compositional dependence. The bulk and shear modulus increases monotonically with increase in the concentration of tetrahedral boron which increases network dimensionality. The variation of bulk moduli has also been correlated to the variation in energy densities. The Poisson's ratio found to be insensitive to the concentration of tetrahedral boron in the structure. The experimental Debye temperatures are in good agreement with the expected theoretical values. Experimental observations have been examined in view, the presence of borate network and the possibility of non-negligible participation of lead in network formation