AC-Conductivity and Dielectric Properties of γ-Irradiated PVA Films Doped With Mn2+ Ions

The stability as well as the electrical properties of both unirradiated
and γ-irradiated poly(vinyl alcohol)-PVA films doped with MnSO4.H2O at a
definite concentration of 15% have been studied. The dielectric loss tangent tan
δ, electrical conductivity σ and dielectric constant ε’ in the frequency range
100 Hz-20 KHz were measured at different temperatures. It has been
demonstrated that the suitable mechanism of conduction is the correlated
barrier hopping model. The exponent S according to the relation σ(ω)=A(ω)s
was estimated and found to be less than unity and decreased with increasing
the temperature Furthermore a nonlinearly of log σ against log f was observed
at log f in the range (3.7-4.3) for doses ≥100 kGy at the temperatures of 333
and 343 k.