Field-induced transformations in the biaxial order of non-tilted phases in a bent-core smectic liquid crystal

The structural and electro-optic investigations of an achiral bent-core molecule in SmAP_A phase, in which the polar directors in the neighboring layers are arranged anti-ferroelectrically, show that it undergoes transformation from one biaxial to another biaxial structure via a quasi-stable uniaxial structure on the application of the electric field. The non-continuous change in biaxiality is explained by an intermediate state in which the secondary directors in the neighboring layers are perpendicular to each other.