Etude de la cinetique d'oxydation de magnetites finement divisees. I - Influence de la substitution par l'aluminium |
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| Authors: | Bernard Gillot Joseph Tyranowicz Abel Rousset |
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| Affiliation: | Laboratoire de Recherches sur la Réactivité des Solides associé au C.N.R.S. Faculté des Sciences Mirande - 21000 Dijon, France;Laboratoire de Chimie Minérale, U.E.R. de Chimie - Biochimie 48, Boulevard du 11 Novembre 1918 - 69621 Villeurbanne, France |
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| Abstract: | The kinetics of finely divided, (Fe2+Fe3+2?xAl3+x)O4 type (0 ? x ? 2), substitution magnetites oxidation into metastable phase γ(Fe3+1?yAl3+y)2O3 (x = 3y) has been accounted for by means of the law of diffusion, under variable working conditions, of the cationic vacancies generated at solid-gas interface with a diffusion coefficient that decreases when the stoichiometric difference is high. The crystallites size and the trivalent substituant percentage increases, in both cases, slow down the reaction rate. |
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