CobaltMaghrebV1, France, Analysis, bibRecord, 000403

Cationic Distribution and Oxidation Mechanism of Trivalent Manganese Ions in Submicrometer Mn x CoFe2− x O4Spinel Ferrites

Identifieur interne : 000403 ( France/Analysis ); précédent : 000402; suivant : 000404

Cationic 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.

RBID : ISTEX:6B36150496E672FD4DFCE7CC18D0DEEDBEDC925B

Descripteurs français

Pascal (Inist)
- 6166F, Co Fe Mn O, Cobalt oxyde, Composition chimique, Composé quaternaire, Conductivité électrique, Cristallochimie, Distribution ion, Etude expérimentale, Fer oxyde, Ferrites spinelles, Forme sphérique, Manganèse oxyde, MnxCoFe2-xO4, Mécanisme réaction, Oxydation, Paramètre cristallin, Particule fine, Réaction topotactique, Solution solide, Spectre IR, TGA, Valence, XRD.
Wicri :
- geographic : Valence (Drôme).

English descriptors

KwdEn :
- Chemical composition, Cobalt oxides, Crystal chemistry, Electric conductivity, Experimental study, Ferrites spinels, Fine particle, Infrared spectra, Ion distribution, Iron oxides, Lattice parameters, Manganese oxides, Oxidation, Quaternary compounds, Reaction mechanism, Solid solutions, Spherical shape, TGA, Topotactic reaction, Valence, XRD.

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.

Url:

https://api.istex.fr/document/6B36150496E672FD4DFCE7CC18D0DEEDBEDC925B/fulltext/pdf

DOI: 10.1006/jssc.1996.0266

Affiliations:

Links to Exploration step

ISTEX:6B36150496E672FD4DFCE7CC18D0DEEDBEDC925B

Le document en format XML

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Serveur d'exploration sur le cobalt au Maghreb

Cationic Distribution and Oxidation Mechanism of Trivalent Manganese Ions in Submicrometer Mn x CoFe2− x O4Spinel Ferrites

Cationic Distribution and Oxidation Mechanism of Trivalent Manganese Ions in Submicrometer Mn x CoFe2− x O4Spinel Ferrites

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

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