Abstract
Data on the volume changes of the starting reagents and reaction products were used to analyze the reactions taking place in the ferrite-forming systems MgO–Fe2O3 , Mn0.75Mg0.25O–Fe2O3 , and NiO–Fe2O3 in the temperature range 1255–1315°C. It was shown that, under these conditions, there is no oxygen transport through the gas phase. The possible formation of Fe2+ ions is attributed to partial electron compensation for the charge on the M2+ cations as a result of counterdiffusion. The presence of excess Fe in the spinel phase at the intermediate stages of ferrite formation is due to the transformation of α-Fe2O3 into γ-Fe2O3 at a certain M2+ concentration.
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