Abstract
Since a rectangular molecule has lower symmetry than rod-like molecule, it is expected to exhibit different phase transition from rod-like one. A simple simulation model is assumed to be represented by tightly connected rigid spheres. We have been performed Monte Carlo simulations under constant volume on system of 512 molecules consisted of 5x2 spheres .We have found a new biaxial smectic phase in addition to isotropic, nematic and smectic phases. This biaxial phase has never appeared for rod-like molecules. The phase transitions for these systems are known to depend only on the concentration of molecule, but not on the temperature. Possibility of occurrence of ferro- and antihero-electric phases will be discussed, when molecules have intrinsic dipole moment.
