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

L. Fournès; G. Demazeau; S. Darracq; J. Etourneau; P. Fabritchnyi; I.A. Presniakov; K.V. Pokholok; V.P. Gorkov

doi:doi:10.1051/jp4:19971148

Numéro		J. Phys. IV France Volume 07, Numéro C1, Mars 1997 7th INTERNATIONAL CONFERENCE ON FERRITES


Page(s)		C1-363 - C1-364
DOI		https://doi.org/10.1051/jp4:19971148

7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-363-C1-364
DOI: 10.1051/jp4:19971148

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

L. Fournès¹, G. Demazeau¹, S. Darracq¹, J. Etourneau¹, P. Fabritchnyi², I.A. Presniakov², K.V. Pokholok² and V.P. Gorkov²

¹ Institut de Chimie de la Matière Condensée de Bordeaux, avenue du Dr. A. Schweitzer, 33608 Pessac cedex, France
² Chaire de Radiochimie, Faculté de Chimie, Université Lomonosov, 119889 Moscou V-234, Russia

Abstract
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.