Cationic Distribution and Oxidation Mechanism of Trivalent Manganese Ions in Submicrometer Mn x CoFe2− x O4Spinel Ferrites
Identifieur interne : 000271 ( Istex/Curation ); précédent : 000270; suivant : 000272Cationic Distribution and Oxidation Mechanism of Trivalent Manganese Ions in Submicrometer Mn x CoFe2− x O4Spinel Ferrites
Auteurs : M. Laarj [Maroc] ; S. Kacim [Maroc] ; B. Gillot [France]Source :
- Journal of Solid State Chemistry [ 0022-4596 ] ; 1996.
Abstract
Submicrometer MnxCoFe2−xO4(0 ≤x< 1) spinel particles with a spherical shape were prepared at low temperature from oxalic precursors. Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn3+and Mn4+ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn3+ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient forx< 0.60 and variable abovex= 0.80 and an activation energy close to 115 kJ mol−1but, however, depending on manganese substitution content.
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DOI: 10.1006/jssc.1996.0266
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S15, Marrakech, Morocco</mods:affiliation><country xml:lang="fr">Maroc</country><wicri:regionArea>Département de Chimie, Faculté des Sciences Semlalia, B.P. S15, Marrakech</wicri:regionArea></affiliation></author><author><name sortKey="Gillot, B" sort="Gillot, B" uniqKey="Gillot B" first="B." last="Gillot">B. 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Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn3+and Mn4+ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn3+ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient forx< 0.60 and variable abovex= 0.80 and an activation energy close to 115 kJ mol−1but, however, depending on manganese substitution content.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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