Elastic Properties of Ba2+ and Mn2+ Metal Ion Doped Lithium Borate Glasses Using Pulse-Echo Technique

The ultrasonic wave velocity (longitudinal and shear), density and attenuation for the ternary glass systems of Li₂O-B₂O₃-BaO and Li₂O-B₂O₃-MnO have been measured at the room temperature by using pulse-echo technique at 5 MHz. The samples were prepared by melt-quenching method. The amorphous nature of the samples was ascertained using X-ray diffractometry (XRD). The measured experimental values are utilized to evaluate elastic moduli, Poisson's ratio, acoustic impedance, internal friction, microhardness, Debye temperature and thermal expansion coefficient. Trends of the co-ordination number, cross-link density, mechanical and thermal stability for the systems are discussed in terms of the structural changes taking place due to variations in composition.