Dielectric relaxation mechanism in mixtures of 1-Butanol and fluorobenzene at lower microwave frequencies

Complex permittivity of 1-butanol and its mixtures with fluorobenzene over a range of concentration were obtained in the radio and lower microwave frequency range at constant temperature. Vector network analyzer (VNA) operating in the frequency range 0.03 MHz to 3.0 GHz was used to obtain complex permittivity spectra. Complex permittivity data points at different frequencies were fitted into Debye model to evaluate dielectric relaxation parameters like, a relaxation time (tau), static permittivity (isin₀) permittivity at high frequency (isin_infin). Various dielectric parameters like excess inverse relaxation time (1/tau)^E, excess permittivity (isin₀ ^E) and Kirkwood correlation factor (g) were also evaluated. These parameters were used to interpret the molecular interaction between the molecular species of the liquid mixtures.