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  • Title: Ferroelectric-chiral-antiferroelectric-racemic liquid crystal phase transition of bent-shape molecules.
    Author: Rauch S, Bault P, Sawade H, Heppke G, Nair GG, Jákli A.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2002 Aug; 66(2 Pt 1):021706. PubMed ID: 12241195.
    Abstract:
    Detailed dielectric, polarization current, electro-optical, and textural observations are reported on an asymmetric banana-shaped compound 1,3-biphenylene-bis[4-(3-fluoro-4-octyloxyphenyliminomethyl)benzoate]. The material possesses a chiral-ferroelectric-racemic-antiferroelectric phase transition. Our studies reveal that the higher temperature ferroelectric phase has a polar double-tilted smectic structure, where both the molecular plane and the long axis are tilted with respect to the layer normal. Accordingly, it has a chiral triclinic structure with an out-of-plane polarization component. The lower temperature phase has a monoclinic symmetry, which is higher than that of the higher temperature phase. To our knowledge, among liquid crystals such situations were previously observed only in reentrant phases.
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