  Calculation of energy of migration for number of molecular crystals
consisting of centrosymmetrical and non-centrosymmetrical molecules was carried
out by using a method of atom-atom potentials. It is shown, that the potential
barrier is symmetrical for crystals consisting of centrosymmetrical molecules,
but not symmetrical for the mixed crystals and crystals consisting of
non-centrosymmetrical molecules. Thus it is possible to influence quantity of
migration energy, growing the mixed crystals with a particular arrangement of
components.
