Approach to dissociation energy and elastic properties of vanadate and V2O5-contained glasses from single bond strength: Part I

Abstract

A systematic study has been carried out to understand changes in the structure and predict the composition dependence of elastic properties in a large number of vanadate and V2O5-contained tellurite, borate and phosphate glass systems. Both the glass dissociation energy per unit volume and packing density were estimated from the dissociation energies per unit volume and packing factors of the oxide constituents. Values of the theoretical elastic moduli and Poisson's ratio were calculated on the basis of Makishima–Mackenzie's theory and compared with the corresponding experimental values. The results reveal that, although the experimental data of Poisson's ratio appear to be predictable from the calculated packing densities, majority of the samples have values of theoretical elastic moduli much greater than the experimental ones. The disagreement between theoretical and experimental elastic moduli was discussed in terms of the basic structural units that constituting the glass network. Both the dissociation energy per unit volume and elastic moduli were evaluated in terms of the average single bond strength of V–O and P–O bonds, for the first time. A very good agreement between the theoretically calculated and experimentally measured data of elastic moduli was achieved for majority of the investigated glass samples.