WATTIAUX, Alain; FOURNÈS, Léopold; ZHOU, F.; GRENIER, Jean-Claude; POUCHARD, Michel; ETOURNEAU, Jean

doi:10.1051/jp4:19971142

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WATTIAUX, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

FOURNÈS, Léopold
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

ZHOU, F.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal de Physique IV Proceedings. 1997, vol. 07, n° C1, p. C1-351-C1-352

EDP Sciences

Résumé en anglais

The nonstoichiometry and the vacancy ordering in the perovskite Ca2LaFe3O8 has been investigated in previous works [1,2]. More recently, the occurrence of a large nonstoichiometric domain has been shown in the Sr2LaFe3O8+δ system [3]. Thus, we have used a new "Chimie Douce" method : electrochemical oxidation which has been developped in our laboratory [4] for obtaining Sr2LaFe3O8.90 in alkaline medium. The starting material Sr2LaFe3O8 has been characterized by XRD, chemical analysis and Mössbauer spectroscopy. This compound contains only Fe3+. The Mössbauer spectroscopy reveals, in the oxidized phase, the occurrence of antiferromagnetic interaction below TN = 195 K with a good agreement with electric and magnetic measurements. At low temperature, the presence of two sextets can be explained in terms of a charge disproportionation : 2 Fe 4+ → Fe(4-λ)+ + Fe(4+λ)+ .< Réduire

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Perovskite

Nonstoichiometric

Mössbauer spectroscopy

Oxidation

Electrochemistry

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Mössbauer Characteristics of the Nonstoichiometric Sr2LaFe3O8+δ Perovskite Obtained by Electrochemical Oxidation

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