Elastic and Structural Studies on some Bismuth Borate Glasses using Ultrasonic and Spectroscopic Techniques

B2O3-Bi2O3, B2O3-Bi2O3-ZnO and B2O3-Bi2O3-CaO glasses of different compositions were prepared by using the melt quench technique. The Ultrasonic velocities (both longitudinal and transverse) were measured at 10MHz at room temperature using the pulse-echo overlap method. From the measured values of velocity and density, elastic constants and other parameters such as molar volume, Poisson's ratio, acoustic impedance, microhardness, Debye temperature and thermal expansion coefficient have been evaluated. The variations in these parameters are analysed in terms of structural changes in the glass network with composition. The amorphous nature of the glass samples is studied using XRD. The FTIR investigation is used to identify the functional groups present in the glass samples.