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Science 26 February 1965:
Vol. 147. no. 3661, p. 1033
DOI: 10.1126/science.147.3661.1033
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Articles

Magnetite Oxidation: A Proposed Mechanism

Umberto Colombo 1, Franco Gazzarrini 1, Giuseppe Lanzavecchia 1, and Giuseppe Sironi 1

1 Montecatini Co., "G. Donegani" Research Institute, Novara, Italy

All magnetites are oxidized topotactically with formation of solid solution at temperatures below 400°C. The oxidation of hematite-free magnetites proceeds to ggrFe2O3, whereas in the presence of hematite epitaxial growth of agrFe2O3 takes place, with excess iron ions being returned to the solid solution. A method for synthesizing maghemite from natural magnetites is indicated.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)