ИСТИНА

We have investigated the origin of spontaneous polar ordering in smectic liquid crystals in the framework of molecular-statistical approach [1]. The polar order parameter is introduced.We have shown that piezoelectric spontaneous polarization should generally be related to the bent shape of molecules (even for the molecules which are not normally considered as bent-shaped), while both chirality and polarization appear due to the presence of the electric dipole in the direction perpendicular to the plane of molecular bend.