Electrochemical synthesis and the physicochemical properties of a nanodispersed system based on iron and aluminum oxides

Abstract

An Al₂O₃–Fe₂O₃ dispersed oxide system has been obtained electrochemically in aqueous solutions containing chloride ions with the subsequent thermal treatment. The phase and elemental composition and structural characteristics of the samples have been studied using X-ray phase analysis, Mössbauer spectroscopy, and scanning electron microscopy. The effect of the electrolysis mode and thermal treatment on the characteristics of the samples which were synthesized is shown. It is found that a high-temperature treatment (1100°C) facilitates the formation of a complex oxide material whose phase composition is a combination of the α-Al₂O₃ (corundum) and α-Fe₂O₃ (hematite) crystalline phases and whose particles have nanometer sizes.