Effect Of Compositional Variation On The Electrical Properties Of Se-Te-Bi-Ag Glassy Alloy

摘要

In this paper we have studied the effect of Ag addition on electrical properties of Se_(80.5)Bi_(1.5)Te_(18-y)Ag_y (y = 1.0, 1.5 and 2.0 at. %) glassy system by using digital picometer (Keithley, model 6487) in the voltage range 0-300V. I-V study reveals that the glassy alloys under study exhibit ohmic behavior at low voltage and non-ohmic at high voltage. The field dependence studies for pellets reveal the ohmic nature of current for voltage less than 60 V and non-ohmic nature of current for voltage greater than 60V. At higher voltage, greater than 60V, thermal effects come into plays which result in an increase in electrical conductivity. The d.c. conductivity is found to increase with an increase in Ag content. The conduction mechanism is discussed in terms of Poole-Frenkel conduction mechanism. The linearity of the plots between ln(I) and V~(1/2) shows that the conduction mechanism in the higher voltage range is of Poole-Frenkel type.