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Temperature Dependence of Dielectric Behaviour of Mhpb(H)Pbc Antiferroelectric Liquid Crystal

Temperature dependence of dielectric behavior of antiferroelectric liquid crystal, MHPB(H)PBC, has been investigated in the frequency range of 1 Hz to 10 MHz. The experimental results have been analyzed using a generalized Cole–Cole expression. There is mainly one relaxation mechanism in SmA* phase, which behaves as soft mode. Two dielectric relaxation processes have been observed in SmCA* phase, one at about 50 kHz and the other at about 400 kHz. Dielectric strengths of both modes remain constant throughout the SmCA* phase, while relaxation frequencies of both modes decrease with decrease in temperature. These two observed modes have been assigned to the in-phase and antiphase azimuthal fluctuations of the director of molecules in the antitilt pairs.