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Co x Fe 3−x O 4 iron cobaltites (1.21<x<2.35) have been prepared in the form of submicronic particles from mixed oxalic precursors heat treated at 900 and 600°C. The samples obtained at 900°C are made of a single spinel phase in which Co 2+ and Fe 3+ ions are distributed in both octahedral and tetrahedral sites and Co 3+ ions are only located in...
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