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  • Title: Induction of ferroelectricity in the B2 phase of a liquid crystal composed of achiral bent-core molecules.
    Author: Etxebarria J, Folcia CL, Ortega J, Ros MB.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2003 Apr; 67(4 Pt 1):042702. PubMed ID: 12786411.
    Abstract:
    We report the observation of a transition from the antiferroelectric B2 phase to a ferroelectric phase in a liquid crystal composed of achiral bent-core (banana-shaped) molecules. The transition is induced by an electric field of magnitude larger than the switching threshold and is not reversible, i.e., the original B2 phase does not reappear upon field removal. The transformation is accompanied by a dramatic texture change, resulting in an almost optically isotropic structure in the absence of field. The ferroelectric character assigned to the structure is based on the electro-optic behavior of the material and on previously reported dielectric measurements. A short-pitch smectic-C*-type structure is proposed for the ferroelectric phase.
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