Isothermal investigation of decomposition of FeSO4&middotH2O-BaO2 mixtures

Isothermal studies were conducted on mixtures of Fe2SO4&middotH2O in BaO2 in molar ratios of n = 4, 2 and 1 at temperatures of 573 and 1073 K, in a closed crucible, in air as gas medium. The solid products of decomposition were investigated by means of X-ray analysis, Moessbauer spectroscopy and electron spectroscopy. The experiments revealed that the mechanism of the process is connected with the formation of different quantities of barium ferrites (BaFeO3, BaFe2O4 and BaFe12O19), as well as BaSO4 and Fe2O3, depending on the quantity of BaO2 in the initial mixture, the partial pressure of the gas components and temperature. Differences were found in the mechanism of the process for the same mixtures under dynamic temperature conditions.