Abstract
Dielectric relaxation spectroscopy of a quickly operating antiferroelectric liquid crystal (W-204D) has been carried out under the influence of bias electric field in the frequency range of 20Hz–20MHz in planar aligned cells. W-204D represents both antiferroelectric (SmCA*) and ferroelectric (SmC*) phases. The temperature dependent dielectric investigation has been studied to explore its effect on the dielectric parameters, where a couple of relaxation modes were observed in SmC* phase. Dielectric characterization reveals a Goldstone mode around 32.595kHz and a Soft mode at ~100kHz in the SmC* phase. To study the collective relaxation processes between these two modes W-204D was examined under the influence of DC bias electric field. Due to helical unwinding at 30V bias Goldstone mode get totally suppressed. Experimental data was modeled by Debye and Cole–Cole method indicated that the relaxations are of non-Debye type. Dielectric variations, distribution parameters and relaxation frequencies of these modes have been calculated at various temperatures.
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