Polarization switching and dielectric relaxations have been investigated in two novel ferroelectric liquid crystal mixtures. The samples of helical pitch ∼12 µm and 0.43 µm respectively were sandwiched in planar cells of 5 µm thickness. P S, τr and γ have been evaluated using polarization reversal current technique. Dielectric relaxation modes have been studied under different bias conditions. In volume stabilized cell configuration (p 0 ≪d) bulk domain mode appears due to the formation of modulated domain structures in bulk region while in surface stabilized cell configuration (p 0 ≫d) surface stabilized domain mode was observed. New relaxation mode appeared at all bias fields in SmC* phase due to the surface effects.
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Ahuja et al. (2000) studied this question.
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