Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5412028 | Journal of Molecular Liquids | 2013 | 6 Pages |
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 20Â Hz-20Â MHz 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 32.595Â kHz and a Soft mode at ~Â 100Â kHz 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 30Â V 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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Authors
S.S. Parab, M.K. Malik, R. Dabrowski, R.R. Deshmukh,