Physical Review E
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.
Rauch, S.; Bault, P.; Sawade, Hans; Heppke, G.; Nair, Geetha G.; and Jákli, Antal (2002). Ferroelectric-Chiral-Antiferroelectric-Racemic Liquid Crystal Phase Transition of Bent-Shape Molecules. Physical Review E 66(2). Retrieved from http://digitalcommons.kent.edu/cpippubs/60