AC conductivity and dielectric constant of poly(vinyl alcohol) doped with MnSO4

AC conductivity of poly(vinyl alcohol) polymer modified by MnSO4 with different concentration from 100 Hz to 100 KHz in the temperature range 293-343 K is reported. Obtained data reveal that AC conductivity is proportional to omega(s) in all compositions (5, 10, 15, 20% MnSO4 by weight). The value of sigma(AC)(omega) depends linearly on the frequency, with slope S ranging between 0.95 and 0.65. The value of S was found to be temperature dependent, which decreases by increasing temperature. This suggests that the Correlated Barrier Hopping model is the most likely mechanism. Moreover, W-M the polaron binding energy, W the height of coulomb barrier, R the hopping distance, R-min the minimum hopping distance, and E-a the activation energy were calculated and found to be composition dependent. (C) 2000 Elsevier Science Ltd. All rights reserved.