Fe(IV) Disproportionation in AFeO3 (A = Ca, Sr) Perovskite Lattices Studied by 119Sn Diamagnetic Probe Mössbauer Spectroscopy

Léopold Fournès (1) , Gérard Demazeau (1) , Stéphane Darracq (1) , Jean Etourneau (1) , P. Fabritchnyi (2) , I. A. Presniakov (2) , K. V. Pokholok (2) , V. P. Gorkov (2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Chaire de Radiochimie

Fa(IV) is an interesting unusual oxidation state of iron stabilized under oxygen pressure. In a perovskite lattice such an oxidation state disporportionates into Fe(III) and Fe(V). The study of this phenomenon is important for a better knowledge of instable valencies. Using 119Sn(IV) as diamagnetic probe in the perovskite lattice of AFeO3 (A=Ca,Sr) the disproportionation 2Fe(IV)=Fe(III) +Fe(V) is discussed versus local steric and electrostatic interactions.

Mots clés: Iron oxidation; Mössbauerspectroscopy; Perovskite

Domaines: Articles anciens

Léopold Fournès, Gérard Demazeau, Stéphane Darracq, Jean Etourneau, P. Fabritchnyi, et al.. Fe(IV) Disproportionation in AFeO3 (A = Ca, Sr) Perovskite Lattices Studied by 119Sn Diamagnetic Probe Mössbauer Spectroscopy. Journal de Physique IV Proceedings, 1997, 07 (C1), pp.C1-363-C1-364. ⟨10.1051/jp4:19971148⟩. ⟨jpa-00254792⟩