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.
Dielectric measurements in the frequency range 100 Hz to 100 kHz have been carried out in a short pitch ferroelectric liquid crystal mixture FLC-6430 (Hoffmann -La-Roche) in the SmC* phase aligned in planar orientation. The effects of temperature, frequency and bias voltage on the dielectric properties of this material have been investigated. The relaxation frequency fr, distribution parameter CI and the dielectric strength E, have been determined. The calculated values were found to be -0.59kHz. 0.134 and 427.77 respectively forfr, a and E, at 45°C. A constant DC bias of 0.13 V/pm applied to the sample partially suppresses the Goldstone mode.
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