Correlation between physical properties and ultrasonic relaxation parameters in transition metal tellurite glasses

The correlation between activation energy of ultrasonic relaxation process through the temperature range from 140 to 300 K and some, physical properties has been investigated in pure TeO2 and transition metal TeO2-V2O5 and TeO2-MoO3 glasses according to Bridge and Patel's theory. The oxygen density (loss centers), number of two-well systems, hopping distance and mechanical relaxation time have been calculated in these glasses from the data of density, bulk modulus and stretching force constant of the glass. It has been found that the acoustic activation energy increased linearly with both the oxygen density and the number of two-well systems. The correlation between the acoustic activation energy And bulk modulus was achieved through the stretching force constant of the network and other structural parameters. Moreover, the experimental values of activation energy (V) agree well with those calculated from an empirical equation presented in this study in the form V = 2.9 x 10(-7) F(F/K)(3.37), where F is the stretching force constant of the glass and K is the experimental bulk modulus. (C) 2003 Elsevier Science B.V. All rights reserved.