Application of Vogel–Tamman–Fulcher (VTF) model to CdS–B2O3 glasses

Abstract

In this paper, we report that the DC electrical conductivity is a very interesting property which provides important information about mechanism in solid. The CdS–B2O3 glasses of different composition were prepared in the laboratory. The conductivity was measure in the temperature 308–473 K. A plot of log σ versus 1/T is drawn for various compositions. From this it observed that electrical conductivity increases linearly with temperature which shows Arrhenius nature for different composition of CdS–B2O3. Activation energy for all samples is laying in the range 0.29–0.82 eV which decreases with mol% of CdS. The decrease in conductivity for greater B2O3 concentrations may be due to reduced segmental motion. The temperature dependence conductivity shows percolative behavior and a clear cross over from Vogel–Tamman–Fulcher to Arrhenius behavior. The adiabatic and non-adiabatic hopping conduction is checked by drawing a plot of log σ versus activation energy at fixed temperature.