Abstract
Bulk yAg2O-40TeO2-(60-y)V2O5 glass samples with different molar contents of 0≤ y ≤ 40 mol% were prepared using the normal melt quenching method. The amorphous state has been checked by using the X-ray diffraction. The effect of high electric field on their conductivity was investigated. At low electric fields, the conduction of these samples was ohmic, whearse at high electric fields, bulk samples show nonlinear behavior. Results obtained from the study of voltage-current characteristic curves show an increase in the electric current density along with an increase in deviation from Ohm's law. Moreover, non-ohmic behavior (at the conditions of different ambient temperature and different electrode distances) showed the negative resistance behavior, which was occurred at electrical fields about (104 V/cm). Based upon the joule heating effect in the current filament, the electrothermal model was considered and so, heat dissipation factor and the electrical activation energy were determined. Also, Boltzmann balance energy differential equation (BBEDE) was solved employing finite element method (FEM). It has been approved that Joule heat increases in current filament and after a very short time, temperature and current density increase rapidly (during about 2 μs) in current filament, confirming the electrothermal mechanism.
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