CRYSTALLOGENESIS OF DISSIPATIVE STRUCTURES. Petrovsky V.A., Troshev S.A., Maltsev A.S., Shilova O.Yu.; Pechorskaya st. 58, Syktyvkar, 167005, Russia.

Entropy of "crystal-medium" system is a sum of entropy of subsytems: solution, frontier lauer and crystal. During crustal growth entropies are changing constantly. According to minimum of production of entropy principle the velosity of change of system entropy aspires to minimum at given thermo-dynamical parameters. Under isotermal conditions it leads to the appearence of crystallogenetic solution exfoliation (CSE). The velocity of crystal growth after definite transitional pe- riod becomes stable. The presence of admixture in solution leads to "poisoning" of growing surface. It affects production of entropy in the system (as a rule, the velocity of growth decreases). The change of exogenous factors affects inflow of external entropy into system and leads to new state of current eguilibrium (periodic damped vibrations of concentration field in the frontier layer, stabilization and destruction CSE, change mass-transfer mechanism, velocity of growth ets.). As a result in crystal - forming system spatial-time dissipative structures appear on differend levels (in solution volume, frontier lauer and crystal matrix of individual).