Dielectric relaxation parameters on PVA and their composition with inorganic metal salt CuSO4 have been carried out at microwave frequency 9.03 GHz and at 308K temperature. The values of different dielectric parameters viz. dielectric permittivity(ϵ′), dielectric loss (ϵ"), ac conductivity (σ ′ ), relaxation time (τ), loss tangent (tanδ), extinction coefficient (k) and refractive index (n), carried out for PVA and PVA/CuSO4 composite films. An increase in the dielectric permittivity was observed on doping of inorganic metal salt CuSO4 into PVA lattice at different concentrations (up to 10%). Dopant present in the low concentration does not significantly affect the dielectric permittivity but as the dopant concentration increases, it creates additional sites for trapping and thereby, enhances the dielectric permittivity. PVA is a polar polymer in which each dipole can act as an electron trap, therefore the observed increment in the dielectric parameters is understood. In general, at microwave frequency the movement of network and modifying ions are held responsible for relative dielectric permittivity and the oscillations between them for losses.

PVA, dielectric relaxation, dielectric loss, extinction coefficient, refractive index