Ultrasonic Investigation on Ferroelectric BaTiO3 Doped 80V2O5?20PbO Oxide Glasses

The frequency dependent ultrasonic velocities (both longitudinal and shear) and attenuation in BaTiO3 doped (80V2O5–20PbO + xBaTiO3) oxide (VPB) glasses (for x = 0, 1, 5, 10, and 15 wt% of the base glass) have been measured using pulse echo overlap method at room temperature. From the measured velocity, density and attenuation, various parameters namely longitudinal, shear, bulk, and Young's moduli, Debye temperature, Poisson's ratio, acoustic impedance and microhardness of the VPB glasses were determined. All these parameters of the glasses increase with addition of BaTiO3 content. On the other hand, attenuation decreases with addition of BaTiO3. The variation of these parameters with the addition of BaTiO3 content was discussed in terms of the change in structure of the glass network. The study reveals that ultrasonic velocity and attenuation measurements have been effectively used as a tool to explore the structural changes and mechanical properties on addition of BaTiO3 in vanadate lead glasses.