ORIENTATIONAL ORDERING FOR SYSTEM OF ELLIPSOIDAL MOLECULES DISPERSED IN CUBIC LATTICE

We represent here some results for a model of migrating and nonmigrati ng ellipsoidal molecules dispersed in a cubic lattice, describing: the orientational ordering in nematics, the possibility of a biaxial orde red liquid state, the orientational ordering in solid hydrogen (ortho- H-2 or para-D-2) or the orientational glassy structure (the ''higher r ank'' glass state). Through this kind of molecular ensemble (in the ca se of the system of ellipsoidal and spherical molecules) it is also po ssible to study the orientational and positional orderings in binary m ixtures and to obtain the so-called plastic state.