Correlations Between Ultrasonic And Structural Properties Of 38.1Cao-20.9Al2O3-4Lb203+0

Ultrasonic velocities (both longitudinal and shear) and attenuations are measured at room temperature and 4 MHz frequency in 38.1CaO-20.9Al2O3-4LbSO3 glasses doped with O, 1.25 and 6.3 mol% TiO2 using a pulse echo technique. Composition dependence of these parameters as well as molar volumes, elastic moduli, microhardness. Debye temperatures and attenuations showed that the rigidity of these glasses decreases with increasing TiO2 content. Experimental results are interpreted in terms of the fraction of four co-ordinated boron atoms, number of network bonds per unit volume and crosslink density.