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- W2005018195 abstract "Valence states of molybdenum and iron ions and their cationic distribution on both octahedral (B) and tetrahedral (A) sites on the spinel structure of submicron molybdenum-substituted magnetites which are oxidized in cation deficient spinels have been performed by derivative thermogravimetry, IR spectroscopy and XPS. It was demonstrated that Fe2+B, Mo3+B, Mo4+B, Fe2+A and Mo4+A are successively oxidized into Fe3+ and Mo6+ ions below 450°C. A quantitative analysis based on this difference of reactivity of iron and molybdenum in relation to occupied sites (A or B) permits us to propose a cationic distribution for initial and oxidized phases. Kinetic studies of the oxidation process of Mo3+ ions suggest that oxidation proceeds by way of a diffusion-controlled reaction in a cation deficient phase of variable composition with a chemical diffusion coefficient dependent on the vacancy content." @default.
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- W2005018195 date "1992-11-01" @default.
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- W2005018195 title "Cationic distribution and oxidation kinetics of trivalent molybdenum ions in submicron molybdenum substituted magnetites" @default.
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- W2005018195 doi "https://doi.org/10.1016/0167-2738(92)90011-d" @default.
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