The monograph covers the theory, methods of study and application of reactions in mixtures of solid substances, which form the basis for the manufacture of many important building and other materials for various purposes. along with the description of the structure and physicochemical properties of crystalline bodies, as well as their behavior during heating associated with the processes of diffusion, sintering, recrystallization, melting, sublimation and polymorphic transformations, the mechanism, thermodynamics, kinetics, principles of classification and methods for regulating the rate of chemical reactions in solids are considered.