Electric surface phenomena ins solid-state systems

Applications of electrochemical methods developed by the author to the study of kinetics and mechanism of solid-state reactions and interphase mass transfer involving polyvalent metal (V, Mo, Nb, W Bi) oxides are reviewed. These oxides are characterized by a high energy, predominantly covalent Me-O chemical bond, and low surface energy. Newly discovered phenomena-anon-Faraday transport stimulated with the flux field of solid oxides, reaction-induced surface diffusion, and the formation of mobile surface phases-are demonstrated to be similar to the phenomena known in the classical colloid chemistry. The possibility of occurrence of the Rebinder effect in solid-state microheterogeneous systems was examined for the first time. The new phenomena were analyzed based on the theory of electrokinetic and electric surface boundary processes. The phenomena under consideration were observed in various high-temperature systems, especially for the interaction of group IIIa oxides with oxide supports of various natures.