Investigation of the Meyer-Neldel Rule for AC Conduction in Glassy Se_(100-x)Te_x Alloys

摘要

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 Se_(100-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.