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Iron Manganites Synthesis by the Soft Chemistry Method

Published online by Cambridge University Press:  21 March 2011

Herve Coradin ,
Sophie Guillemet-Fritsch ,
Fabrice Agnoli ,
Philippe Tailhades  and
Abel Rousset
Herve Coradin
Affiliation:
Centre Interuniversitaire de Recherche et d'Ingenierie des Materiaux UMR CNRS 5085, LCMIE, Universite Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
Sophie Guillemet-Fritsch
Affiliation:
Centre Interuniversitaire de Recherche et d'Ingenierie des Materiaux UMR CNRS 5085, LCMIE, Universite Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
Fabrice Agnoli
Affiliation:
Centre Interuniversitaire de Recherche et d'Ingenierie des Materiaux UMR CNRS 5085, LCMIE, Universite Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
Philippe Tailhades
Affiliation:
Centre Interuniversitaire de Recherche et d'Ingenierie des Materiaux UMR CNRS 5085, LCMIE, Universite Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
Abel Rousset
Affiliation:
Centre Interuniversitaire de Recherche et d'Ingenierie des Materiaux UMR CNRS 5085, LCMIE, Universite Paul Sabatier, 118 route de Narbonne 31062 Toulouse, France
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Abstract

The iron manganites FexMn(3−x)O4 synthesis by soft chemistry method have been studied. The main difficulty is to obtain single phase spinel with high Mn content (0.4< x < 1.3). Oxalate precursor powders of these materials with controlled shape and nanoscopic size have been prepared. The precursors are then heat treated with a H2/H2O/N2 gas mixture at low temperature. The resulting stoechiometric spinels are metastable phases with high specific surface area and are highly reactive toward oxygen. Therefore, these oxide can be oxidized in air at low temperature in order to produce mixed valence defect manganites FexMn(3−x)O4+δ with a good reproducibility on the oxygen content. Although, some problems persist for the higher Mn contents, as the oxygen partial pressure for the reduction must be controlled precisely in order to produce the stoechiometric spinel at low temperature. The development of a low temperature reduction system, with oxygen partial pressure controlled by oxygen electrochemical pumping, is in progress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , T3.5
Copyright
Copyright © Materials Research Society 2001

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References

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