Role of metallic Zn and In additives in the electrical and dielectric properties of $Se _{0.85}Te _{0.15}$ glassy alloy

Abstract

In this paper we report the effect of metallic Zn and In additives on the electrical and dielectric properties of $Se _{0.85}Te _{0.15}$ glassy system. The temperature and frequency dependence of the dielectric parameters in glassy $Se _{0.85}Te _{0.15}$ , $Se _{0.75}Te _{0.15} In _{0.10}$ and $Se _{0.75}Te _{0.15}Zn _{0.10}$ alloys are studied by measuring capacitance and dissipation factor in the frequency range (1 kHz–5 MHz) and temperature range (300–350 K). Direct current (dc) measurements were also performed in the aforesaid temperature range to assess the dc conduction losses. Results are interpreted in terms of a theoretical model which is based on two electron hopping over a potential barrier and is applicable in the present case. Dielectric constant ε' , dielectric loss ε'' and loss tangent δ are found highly frequency and temperature dependent. Dependence of electrical and dielectric parameters on the additives has also been found in the present glassy system and has been discussed in terms of electronegativity difference between the elements used in making the aforesaid glassy system.