Ferrielectric Chiral Smectic Liquid Crystalline Phase

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Abstract
We summarize the experimental results observed in the ferrielectric smectic liquid crystalline phase of MHPOBC by such as DSC, dielectric, X-ray, conoscope, rotatory power and electro-optic measurements. By using the newly obtained information for the pitch in this phase, we propose a novel structure of the ferrielectric phase; the repeating unit consists of three layers, so that the molecules have ferroelectric and antiferroelectric interactions with the ratio of 1:2.