Dielectric Relaxations in a Short Pitch Ferroelectric Liquid Crystal

Abstract

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.

Effect of barium titanate nanoparticles of different particle sizes on electro-optic and dielectric properties of ferroelectric liquid crystal

“…These facts clearly support the presence of both the above-mentioned modes in pure LC host. [30] Similar results were also obtained for both doped samples. For the 0.5 wt% of BaTiO 3 (particle size 5À10 nm) doped 6F 6 T sample the soft mode and the Goldstone mode appear at 41 and 34 C, respectively, and are shown in Figure 9.…”