Magnetite Oxidation: A Proposed Mechanism

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Science  26 Feb 1965:
Vol. 147, Issue 3661, pp. 1033
DOI: 10.1126/science.147.3661.1033


All magnetites are oxidized topotactically with formation of solid solution at temperatures below 400°C. The oxidation of hematite-free magnetites proceeds to γFe2O3, whereas in the presence of hematite epitaxial growth of αFe2O3 takes place, with excess iron ions being returned to the solid solution. A method for synthesizing maghemite from natural magnetites is indicated.