Dielectric dispersion and relaxation of mixtures of 1-propanol and phenol at lower microwave frequencies

Complex permittivity of 1-propanol, phenol and mixtures of 1-propanol + phenol over wide range of concentration are measured over the frequency range 30MHz to 3.0 GHz using Vector Network Analyzer (VNA). Open ended co-axial probe technique suggested by Wei and Sridhar [Rev Sci Instr, 60 (9) (1989) 304] is used to obtain dielectric constant. The measured values of E and E are fitted to Debye equation to obtain dielectric parameters. Obtained values of relaxation time of liquid mixtures are plotted against the concentration of one of the components of the liquid mixtures. Non-linear variation of relaxation time with concentration has been interpreted in terms of molecular interaction among the molecular species of different kinds in liquid mixtures.