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Valence States of Copper and Cation Distribution in Submicron Copper Ferrite Spinels CuxFe3-xO4(0≤x≤1)

Abstract : Valence States studies of copper and iron ions and their cation distribution on both octahedral (B) and tetrahedral (A) sites on the spinel structure of submicron copper-substituted magnetites, CuxFe3-xO4 (0≤x≤1) which are oxidized in cation deficient spinels CuxFe3-xO4+δ (0≤δ≤0.5) have been performed by TG, DTG, FT-IR and XPS when the copper content determine the number of oxidizable cations 1-x = (Fe2+ + Cu+) per mole of ferrite. It was demonstrated that Fe2+ and Cu+ ions are oxidized into Fe3+ and Cu2+ ions below 300°C and that the availability to diffuse could be envisaged as follows : Cu+B(130°C) < Fe2+B(185°C) < Cu+A(240°C) . For high copper content (≥0.4), the presence of additional interstitial Cu+ ions in tetrahedral sites has also been found.
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Submitted on : Wednesday, January 1, 1997 - 8:00:00 AM
Last modification on : Wednesday, January 1, 1997 - 8:00:00 AM
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E. Kester, B. Gillot, P. Perriat, C. Villette, Ph. Tailhades, et al.. Valence States of Copper and Cation Distribution in Submicron Copper Ferrite Spinels CuxFe3-xO4(0≤x≤1). Journal de Physique IV Colloque, 1997, 07 (C1), pp.C1-261-C1-262. ⟨10.1051/jp4:19971101⟩. ⟨jpa-00254722⟩

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