Study by thermogravimetry, electrical conductivity and IR spectrometry of the phase transition for manganese cation deficient spinels
Identifieur interne : 000953 ( Istex/Curation ); précédent : 000952; suivant : 000954Study 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.
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DOI: 10.1007/BF00551316
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<front><div type="abstract" xml:lang="en">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.</div>
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