Abstract
A detailed investigation of the electro-optical switching parameters of an antiferroelectric liquid crystal (S)-(+)-4-(1-methylheptyloxycarbonyl) phenyl 4′-(6-octanoyloxyhex-1-oxy) biphenyl-4-carboxylate (abbreviated as S-7H6Bi) has been carried out. S-7H6Bi has paraelectric (SmA ⁎) and ferroelectric (SmC ⁎) phases in addition to antiferroelectric (SmC ⁎ A) phase. Switching parameters viz. spontaneous polarization and switching time were determined by polarization reversal method. The spontaneous polarization ( P s) is found to be highly temperature dependent and decreases with temperature. The maximum value of P s is found to be ∼90 nC/cm 2 whereas the switching time ( t s) is found to be of the order 1–2 ms. The temperature dependent torsional viscosity ( γ t) is of the order 10 Pa sec. It increases with decrease in temperature.
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