A bent-shape liquid crystal compound with antiferroelectric triclinic-monoclinic phase transition

摘要

Electro-optical and polarization current measurements on 1,3-phenylene-bis[4-3-fluoro-4-decyloxyphenyliminomethyl)benzoate] (3F-10-O-PIMB) revealed a second order phase transition between two antiferroelectric 'smectic banana' phases. The observations show that the switching between the ferroelectric states in the higher temperature (HT) phase requires higher thresholds than in the lower temperature (LT) phase. It is hypothesized that the HT phase has a lower (triclinic, C_1) symmetry, than that of the LT phase (monoclinic, C_2) It is also shown that electric fields can induce transitions between different 'smectic banana' phases.