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The work is presented, leading to the universal contact molecular mechanismof phase transitions and other reactions in solid state. The two components ofthe mechanism - nucleation and interface propagation - are investigated indetail and their role in the kinetics is specified. They were shown to bepeculiar: nucleation is "pre-coded", rather than resulted from a successfulfluctuation, and the interface propagates by molecular filling of thin layersin the transverse direction. The structure of the nucleation sites isdetermined. The inherent instability and irreproducibility of the kinetics inquestion is revealed. A linear kinetics, as opposed to the bulk kinetics, isintroduced and shown to be in accord with the contact mechanism. Ferromagneticphase transition and magnetization are added to the list of solid-statereactions; neither occurs without structural rearrangement.

Mechanism and kinetics of phase transitions and other reactions in solids