Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
Identifieur interne : 000258 ( Maroc/Analysis ); précédent : 000257; suivant : 000259Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
Auteurs : B. Gillot [France] ; M. El Guendouzi [France] ; M. Laarj [Maroc] ; P. Tailhades [France] ; A. Rousset [France]Source :
- Journal of Materials Science [ 0022-2461 ] ; 1988-09-01.
Abstract
Abstract: Thermogravimetry, electrical conductivity and IR spectrometry were used to study the crystal structure change of the metastable manganese cation deficient spinels that occur during the oxidation of manganese ions above 500° C. The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn3+ ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.
Url:
DOI: 10.1007/BF00551316
Affiliations:
- France, Maroc
- Bourgogne, Bourgogne-Franche-Comté, Midi-Pyrénées, Occitanie (région administrative)
- Dijon, Toulouse
- Université Toulouse III - Paul Sabatier
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ISTEX:58020309D601DBEB23FE497E54ACAC44B4663D4BLe document en format XML
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The kinetic of the transformation is found to be governed by a nucleation growth mechanism with an activation energy varying with the amount of Mn3+ ions. The nature of the inversion products depends on the manganese substitution extent. We observe for a substitution extent x<0.72 a phase with a corundum structure which is a solid solution of α-(MnFe)2O3 and for x>0.72 a mixture of two phases α-(MnFe)2O3 + Mn2O3 of orthorhombic structure.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Bourgogne</li><li>Bourgogne-Franche-Comté</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Dijon</li><li>Toulouse</li></settlement><orgName><li>Université Toulouse III - Paul Sabatier</li></orgName></list><tree><country name="France"><region name="Bourgogne-Franche-Comté"><name sortKey="Gillot, B" sort="Gillot, B" uniqKey="Gillot B" first="B." last="Gillot">B. 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