The dielectric dispersion in the ferroelectric and antiferroelectric phases of a smectic liquid crystal, 4-(1-methylheptyl-oxycarbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC), has been measured with several frequencies between 100 Hz and 100 kHz. The soft mode with the Debye-type dispersion was observed in the phase transition from the Sm A phase to the ferroelectric Sm C * phase. In the Sm C * phase, the Goldstone mode was observed at the frequency of about 4.5 kHz. The dielectric dispersion in the Sm C A * , Sm C α * and Sm C γ * phases is discussed.
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Fukui et al. (1990) studied this question.
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