Investigation on dielectric relaxations of PVP-NH4SCN polymer electrolyte

Poly (N-vinyl pyrrolidone) (PVP) and ammonium thiocyanate (NH₄SCN) based polymer films with different compositions have been prepared by solution casting technique. The amorphous nature of the polymer electrolytes has been confirmed by XRD analysis. The FTIR analysis confirms the complex formation of the polymer with the salt. The conductivity analysis shows that the 20 mol% ammonium thiocyanate doped polymer electrolyte has high ionic conductivity and it has been found to be 1.7 × 10⁻⁴ S cm⁻¹, at room temperature. From the admittance plot, the activation energy has been found to be low for 20 mol% salt doped polymer electrolyte. The dielectric behavior has been analyzed using dielectric permittivity (ε^∗), dissipation factor (tan δ) and electric modulus (M^∗) of the samples.