Low Frequency Dielectric Relaxation and Optical Behaviour of a Nematic Liquid Crystal 4-Methyl (2'-Hydroxy, 4'-N-Hexadecyloxy) Azobenzene

摘要

The present study reports an investigation on the low frequency dielectric relaxation of a nematic liquid crystal examined in the frequency range of 1 KHz to 10 MHz and in the temperature range from 25°C to 100°C. The optical behaviour has also been reported by measuring the refractive indices, birefringence and optical transmittance in the same temperature range mentioned above. The birefringence data has been used to calculate the order parameter by Vuks approach and its variation with temperature has been discussed. The transition temperature obtained by using different techniques is found to be in good agreement with each other.