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The A. C. Impedance Study of Polycrystalline Zinc Telluride

A. Nasar and M. Shamsuddin

The complex impedance of polycrystalline zinc telluride has been measured as a function of frequency (1.0 x 102 – 1.3 x 107 Hz) by a two probe technique in the temperature range of 300 – 469 K. The data have been presented in term of complex impedance plane formalism and suitable equivalent circuits have been proposed at different temperatures. The values of resistance and capacitance of grains and grain boundaries have been successfully separated from the total values by employing complex plane analysis. The results have been discussed in the light of contributions of grains and grain boundaries taking part in the overall conduction process.