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Temperature and frequency dependence of a.c. conductivity have been studied in glassy Se 100-x Te x (x = 10, 20 and 30) over different range of temperatures and frequencies. An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of selenium-tellurium system (Se 100-x Te x ) can be successfully explained by correlated barrier hopping (CBH) model. The density of defect states has been determined using this model for all the glassy alloys. Thedoi:10.1007/bf02706345 fatcat:u6dstznbgnhcbgbmh65xionbie