Soft mode dielectric relaxation under the influence of bias electric field of a ferroelectric liquid crystal mixture.

SS Roy, TP Majumder, SK Roy

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    Abstract

    Temperature dependent soft mode part of the complex dielectric constant has been measured as a function of bias electric field both in the smectic C* and smectic A* phases for a ferroelectric liquid crystal (FLC) mixture. From the experimental data, soft mode relaxation frequency and dielectric strength have been determined both in smectic C* and smectic A* phases. In smectic B* phase, relaxation frequency and inverse of dielectric strength of the FLC mixture does not follow the Curie-Weiss law. The critical exponent for the studied FLC mixture is 1.43. Dielectric results shows a dependence of soft mode dielectric strength and relaxation frequency with bias field near the transition temperature in smectic A* phase to an extent of 1 degrees C above the transition temperature and above 1 degrees C bias field does not have any effect on relaxation frequency and dielectric strength It is observed that relaxation frequency increases with increasing bias held while the corresponding dielectric strength decreases.
    Original languageEnglish
    Pages (from-to)315-320
    JournalMolecular Crystals and Liquid Crystals
    Volume304
    Publication statusPublished - 1997

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