Elastic properties and structural studies on boro-vanadate glasses containing sulphate (SO42-) ions

Abstract

Elastic properties of xLi2SO4-16Li 2O-(84-x)[0.7B2O3-0.3V2O 5] where (5≤x≥30) glasses have been prepared by melt quenching method and structural investigations were carried out using ultrasonic pulse echo overlap technique at a frequency of 10 MHz and at 300 K. The molar volume increases and the density decreases with the increase of Li2SO 4 concentration due to the incorporation of SO42- ions into the modified macromolecular network. The addition of Li2SO4 content leads to loose packing structure which is attributed to volume increasing effect and the reduction in the vibrations of borate and vanadate lattices. Increase in Li2SO4 results in decreasing cross link density which in turn decreases elastic moduli. The results are discussed in view of its network structure. The structural groups [VOO3/2]0 and [BO3/2] 0 modify preferentially. This preference in modification is decided by the electronegativity (χ) of the structural groups. © 2011 American Institute of Physics.