Electrode polarization and ionic conduction relaxation in n-Hexanol and DMF Mixtures at 303.15 K: insights into molecular dynamics

Abstract

Using a precision LCR meter, the real and imaginary components of the complex relative dielectric function (ε*(f) = ɛ'(f)—jɛ”(f)) of the binary mixtures of n-Hexanol and N, N-Dimethylformamide were measured in the frequency range of 20 Hz to 2 MHz at a constant temperature of 303.15 K. Complex relative dielectric function ε*(f), was then converted into various formalisms namely: complex electric modulus M*(f), complex electrical conductivity σ*(f), and complex impedance Z*(f) in order to explore the electric and dielectric characteristics of the liquid samples. Loss tangent (tan δ = ɛ"/ɛ') was determined from the complex relative dielectric function ε*(f). Further, ε*(f) was fitted to the Cole–Cole relaxation model to determine different dielectric and electrical parameters. Relaxation time associated with various relaxation processes observed in the considered frequency range of applied ac electric field are determined. Measured dielectric data are used to gain information about the effect of electrode polarization relaxation and ionic conduction relaxation process in the given mixture. Various parameters, including Debye Length (λ_D), Ion Mobility (μ), Mobile Ion Concentration (P₀), and Ion Diffusivity (D) were computed for each binary mixture across constant temperature.