| Numéro |
J. Phys. Colloques
Volume 40, Numéro C2, Mars 1979
International Conference on The Applications of The Mössbauer Effect
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|---|---|---|
| Page(s) | C2-313 - C2-315 | |
| DOI | https://doi.org/10.1051/jphyscol:19792110 | |
J. Phys. Colloques 40 (1979) C2-313-C2-315
DOI: 10.1051/jphyscol:19792110
CHARGE DISPROPORTIONATION IN Fe4+-OXIDES WITH PEROVSKITE-TYPE STRUCTURES
M. Takano1, N. Nakanishi1, Y. Takeda2 and S. Naka21 Department of Chemistry, Faculty of Science, Konan University, Kobe, Japan
2 Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Nagoya, Japan
Résumé
On a étudié deux séries de solutions solides de structure perovskite Ca1-xSrxFeO3 et Sr1-xLaxFeO3 pour tester notre modèle de distribution de charges dans les oxydes Fe de type Fe4+ (2Fe4+ → + Fe3+ + Fe5+). Le spectre Mössbauer de Sr 0,5La0,5FeO3 à 4 K confirme clairement ce modèle. Pour les deux séries, le modèle semble correct à la température TN.
Abstract
For a further examination and elaboration of our simple charge disproportionation model for Fe4+-oxides, 2Fe4+ → Fe3+ + Fe5+, two series of solid solutions Ca1-xSrxFeO3 and Sr1-xLaxFeO3 with the perovskite structure have been studied. The Mössbauer spectrum of Sr0.5La0.5FeO3 at 4 K clearly indicates the disproportionation. For both series of oxides, the disproportionation seems to set in at the TN's.