Origin of coercivity changes during the oxidation of Fe3O4to γ-Fe2O3 |
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| Authors: | Kojima H Hanada K |
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| Affiliation: | Tohoku University, Sanjyo-Machi, Sendai, Japan; |
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| Abstract: | Oxidation kinetics and x-ray diffraction of the intermediate products have been investigated for several kinds of Fe3O4powders during the oxidation to γFe2O3. From these results, a two-components-hypothesis as an intermediate state of the Fe3O4- γFe2O3system is proposed, instead of a homogenious solid solution which has been widely recognized. The effect of the changes in particle size caused by the two phases oxidation products on the variations of magnetic coercivity was emphasised. |
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