Study on Physical and Elastic Properties of Lead Borate Glasses Using Ultrasonic Techniques and Thermal Analysis

Lead based borate glass systems of binary PbO - B2O3 with different compositions are prepared by melt-quenching technique. Density of all the glass samples is measured using relative measurement method. The longitudinal and shear ultrasonic velocities are measured for all the compositions at 303 K and at 10 MHz frequencies using the Pulse Echo overlap method. Elastic moduli and other parameters such as molar volume, Poisson’s ratio, acoustic impedance, microhardness, Debye and softening temperature and thermal expansion co-efficient are calculated from density and velocity data, and they are used to gain knowledge about the structural and physical properties of these glasses and are correlated to the rigidity and compactness of the glass systems. The thermal stability of the glass samples is investigated by Thermo Gravimetric (TG) Analysis and it is used to measure the weight loss as the temperature of the sample is increased. Differential thermal analysis (DTA) is used to identify the glass transition temperature, crystallization temperature and melting temperature.