MECHANOCHEMICAL REACTIONS OF HYDRATED OXIDES

Thermodynamic calculations have shown that chemical reactions in mixtures of hydrated oxides are more advantageous than those in anhydrous oxide mixtures. Mechanochemical reactions of calcium oxide with hydrated and anhydrous aluminum, silicon, titanium, vanadium, and tungsten oxides are investigated experimentally. It was shown that the reaction rate is correlated with the thermodynamic reaction potentials, and also with differences in the proton affinity of the oxides. The influence of water additives on the synthesis rate was investigated. It was found that the reaction rate goes through a maximum in its dependence on water content. (C) 1994 Academic Press, Inc.