Molecular polarization, order parameter and dielectric study of a dimeric compound

Abstract

Molecular polarization, order parameter and dielectric study of a dimeric liquid crystalline compound 7.O5O.7 is reported in this article. Vuk's and Neugebauer's methods were used to determine the molecular polarization and direct extrapolation method using birefringence data, as well as Vuks' method, Neugebaur's method, modified Vuks' method from Haller's extrapolation were used to calculate the order parameter of the compound. To investigate the dielectric relaxation parameters Cole-Cole plots were used. The Cole - Cole plots of the compound were semi-circular in nature and they exhibited non-Debye type of behaviour. To understand the electrical property more precisely, an electrical equivalent circuit model was design. Levenberg–Marquardt (LM) algorithm theoretical model was used to fit the experimental results. The designed circuit model could exactly replicate the experimental data and showed a precise fitting. Lorentz and internal field factor with variation of temperature is also reported in this article.