ANDERSON-STUART MODEL OF IONIC CONDUCTORS IN Na2O-SiO2 GLASSES

Glasses based on sodium silicates [xNa2O⋅(1−x)SiO2] with x = 30, 35, 40, 45 and 50 mole%, have been prepared. These materials were investigated mainly by direct conductivity and Impedance Spectroscopy techniques for electrical characterization below Tg. In this work we discuss our data obtained by these conductivity measurements and comparison between the data obtained and those published hitherto. A modified Anderson and Stuart model has been used to describe the variation of activation energy with sodium concentration in Na2O-SiO2 system. The agreement between calculated and experimental activation energies is discussed in the light of assumptions used in calculations