Аннотация:The treatment of tin and calcium oxides in a subcritical steam medium (270°C) and a supercritical water fluid medium (400°C) in an autoclave leads to the formation of CaSn(OH)6 and CaSnO3 crystals, correspondingly. The mechanism of interaction during the formation of new phases in a water fluid medium, which is based on an increase in solid-phase mobility in the hydrated areas of surface of solid reactants, is discussed. It is this difference that distinguishes synthesis of mixed oxide in a water fluid medium from the ordinary hydrothermal method, where the components interact in an aqueous solution. The potential energy function used for molecular dynamics simulation of the interaction of CaSn(OH)6 with water at 25 and 270°C is calculated by the density functional theory method.
