Abstract
Ring deformation and bond compression models are used to analyze quantitatively room temperature elastic moduli of x1Ag2O-x2V2O5-(1-x1-x2)TeO2
glass systems, where 3·7≤x1≤19·4 mol% and 24·7≤x2≤42·7 mol%. The main parameters in the analysis are estimated atomic ring size, average crosslink density, first order stretching force constant and theoretical bond
compression bulk modulus Kbc. Structural changes are deduced by relating the ratio Kbc/Ke to both molar volume and atomic ring size of glasses. It is found that increasing the Ag2O concentration opens the glass structure by break-
ing V-O-Te linkages and creating nonbridging oxygen atoms (NBOs) according to the reaction: Ag2O + Te-eqOax-V→Te-eqO-Ag+ (or Te-axO-Ag+) +
V-O-Ag+. In addition, Ag2O-V2O5-TeO2 glasses have a relatively closed (small rings) structure when compared to Ag2O-B2O3-TeO2, B2O3-SiO2,
Na2O-B2O3-SiO2 or Na2O-K2O-CaO-PbO-SiO2 glasses.