PRE-EXPONENTIAL FACTOR OF A.C. CONDUCTION IN Se80Te19.5M0.5(M = Cd, In, Sb) CHALCOGENIDE GLASSES

摘要

In many amorphous and liquid semiconductors and other class of materials, Meyer-Neldel rule is observed in the d.c. conductivity, where the pre-exponential factor (σ0) is found to increase exponentially with the activation energy (.E). In the present paper, we report on the observation of Meyer- Neldel rule in case of a.c. conductivity near the room temperature in bulk samples of Se80Te19.5M0.5 (M = Cd, In, Sb) chalcogenide glasses. The approximate variation of a.c. conductivity with temperature is found to be exponential and the activation energy is found to vary with frequency. The observation of Meyer-Neldel rule in the present study is explained in terms of compensation effect in relaxation