Frequency and temperature dependencies of a.c. conductivity of polyvinyl alcohol (PVA)-CoCl2 composites

Abstract

The a.c. conductivity for polyvinyl alcohol (PVA)-CoCI2 composites prepared by a casting method has been measured at different frequencies (0.1-10 kHz) in the temperature range 300-450 K. At constant temperature, the frequency dependence of a.c. conductivity, cy(~o), was found to fit the established equation c~(c0) = AmSquite well. On the other hand, the temperature dependence of a.c. conductivity suggested an electronic hopping conduction mechanism in a thermally assisted electric field. Various theoretical mechanisms have been discussed to clarify the conduction processes in these samples. The correlated barrier hopping (CBH) mechanism, proposed by Elliott, was found to be the most appropriate one.

Effect of γ-irradiation on the dielectric loss and A.C. Conductivity of polyvinyl Alcohol Doped with CrCl3

“…The clean-cut understanding of the conduction mechanism of disordered polymers has not yet been reached due to the complexity of the polymer structure. A.C. conductivity (σ a.c )and dielectric loss measurements may provide information about the electronic structure of these materials [6][7][8]. Recently [9], a.c. conductivity and dielectric constant of PVA modified by different concentrations of MnSO 3 was studied.…”