Dariush Souri

Effect of high electric field on the dc conductivity of TeO2-V2O5-MoO3 amorphous bulk samples withdifferent molar ratio of eachcomponent was investigated withgap-type electrode arrangement. At low electric fields, the current-voltage (I–V ) characteristics has a linear shape, while at high electric fields (> 103 V/cm), bulk samples show nonlinear behavior (nonohmic conduction) and current-voltage characteristics shows increasing de- viation from Ohm’s law with increasing current density. High-field effect of Pool–Frenkel type was observed at electrical fields about 103 –104 V/cm. In addition, positive devia- tion from Pool–Frenkel effect was observed when a field higher than about 104 V/ cm wa s applied.