Abstract
The a.c. conductivity of a-Se 80Te 20 and a-Se 80Te 10M 10 (M = Cd, In, Sb) alloys has been investigated as a function of temperature in the range from 280 to 330 K and frequency in the range from 10 2 to 10 4 Hz. The experimental results indicate that a.c. conductivity σ ac is proportional to ω s where s < 1 and decreases with increasing temperature. The results obtained are discussed in terms of the correlated barrier hopping (CBH) model. An agreement between experimental and theoretical results suggests that the a.c. conductivity behavior of a-Se 80Te 20 and a-Se 80Te 10M 10 (M = Cd, In, Sb) system can be successfully explained by CBH model. The contribution of single polaron and bipolaron hopping to a.c. conductivity in present alloys is also studied.
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