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Dielectric Relaxation Behavior of Ferroelectric Phase in Antiferroelectric Liquid Crystals

The ferroelectric phase in optically pure samples and racemized ones of an antiferroelectric liquid crystal were studied by a dielectric dispersion experiment. In the optically pure samples, in addition to the Goldstone mode, a new relaxation mode was found, which is related to a molecular motion within the plane parallel to the cell surface. A model based on a field-induced conformation change of molecules was proposed for the ferrielectric-like behavior of SmCβ*.