Elastic moduli and crosslinking of some tellurite glass systems

Tellurite glass systems in the form 80(TeO2)-5(TiO2)-(15 - x)(WO3)-(x)A(n)O(m) have been prepared by the melt quenching technique. The A(n)O(m) oxide was Nb2O5 or Nd2O3 or Er2O3 and x <= 5 mol%. Density and Molar volume have been determined for the prepared glasses. Both longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system by using the pulse-echo method at 5 MHz frequency and at room temperature. Ultrasonic velocity and density data have been used to calculate elastic moduli (longitudinal modulus L, shear modulus G, Young's modulus E, Bulk modulus K), Poisson's ratio sigma, and Debye temperature theta(D). Quantitative analysis of elastic moduli based on the number of bonds per unit volume, average crosslinks and number of vibrating atoms per unit volume has been achieved. (C) 2013 Elsevier B.V. All rights reserved.