Investigation of the Meyer-Neldel rule for AC conduction in glassy Se100-xTex alloys

In many amorphous and liquid semiconductors and other class of materials, the Meyer-Neldel rule is observed in the dc conductivity, where the preexponential factor (sigma(0)) is found to increase exponentially with the activation energy (Delta E). In the present paper, we report on the observation of the Meyer-Neldel rule in case of ac conductivity at high temperatures (300-350 K) in bulk samples of glassy Se100-x Te-x (x = 10, 20, 30) alloys. In this temperature range, the approximate variation in ac conductivity with temperature is found to be exponential and the activation energy is found to vary with frequency. The observation of the Meyer-Neldel rule in the present study is explained in terms of the compensation effect in the relaxation time.