داریوش سوری

The bulk samples of amorphous compositions with different molar percentages have been prepared using the press-melt quenching method. The effect of high electric field on the dc conductivity of present samples was investigated with gap type electrode arrangement. At low electric fields, the conduction of these samples was ohmic, while at high electric fields, bulk samples show nonlinear behavior (non-ohmic conduction). The current-voltage characteristics shows increasing deviation from Ohm’s law with increasing current density. In the present samples, non-ohmic behavior is in coincidence with Pool-Frenkel effect and was occurred at electrical fields about (V/cm). Based upon Pool-Frenkel effect, the lowering factor of potential barrier was determined for these samples. Also, results show that the threshold voltage at switching phenomenon increase and decrease with the increasing of electrode distance and sample temperature for under-studied samples, respectively