Studies of composite films of polyethylene oxide doped with potassium hexachloroplatinate
M-Ali H. Al-Akhras, Shorooq E. Alzoubi, Ahmad A. Ahmad, Riad Ababneh, Ahmad Telfah
Abstract
Abstract The permittivity and conductivity relaxation processes of polyethylene oxide (PEO) composite along with potassium hexachloroplatinate (K 2 PtCl 6 ) electrolytes additive forming PEO/K 2 PtCl 6 complex composite have been investigated. The complex composite has been used as a model for dry‐polymer electrolytes (PEs) due to the fact that, the anion is large enough for mimicking the immobilized anion in real dry‐polymer electrolytes. Stand‐free composite films with 0%, 1%, 3%, and 5% concentrations of K 2 PtCl 6 have been studied using broadband dielectric spectroscopy in the temperatures range from 150 K until 345 K. The microstructural dynamics revealed the α ‐, β ‐, and σ ‐relaxations and their salient spectral characteristics at various concentrations of K 2 PtCl 6 in PEO. The experimental ε ” master curves were fitted to HN function for one and/or two relaxation peaks with and without the electrical conductivity contribution in order to investigate the relaxation time ( τ ), dielectric strengths (Δ ε ), modulus formalism (M”) and the electrical conductivitie ( σ ). The translational and reorientational degrees of freedom of PEO/K 2 PtCl 6 complex composites are responsible for the relaxation behavior which is predicted to be correlated to the relaxation behavior of the polymer electrolyte below and above the glass transition temperature ( T g ). The relaxation time ( τ ) deduced from β ‐relaxation follows Arrhenius‐like behavior while that deduced from α ‐relaxation process follows Vogel–Tamman–Fulcher (VTF) behavior.