| Issue |
J. Phys. Colloques
Volume 40, Number C2, Mars 1979
International Conference on The Applications of The Mössbauer Effect
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|---|---|---|
| Page(s) | C2-331 - C2-332 | |
| DOI | https://doi.org/10.1051/jphyscol:19792117 | |
J. Phys. Colloques 40 (1979) C2-331-C2-332
DOI: 10.1051/jphyscol:19792117
PREPARATION AND CHARACTERIZATION OF CaFeO3 AND ITS SOLID SOLUTION WITH SrFeO3
Y. Takeda1, S. Naka1 and M. Takano21 Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Nagoya, Japan
2 Department of Chemistry, Faculty of Science, Konan University, Kobe, Japan
Résumé
Une étude par effet Mössbauer du système Ca1-xSrxFeO3 (0 ≤ x ≤ 0,75) montre une importante dissociation 2Fe4+ → Fe3+ + Fe5+ en dessous de la température de transition ferromagnétique. A la température ambiante, chaque oxyde a un spectre d'absorption légèrement élargi ; à 4 °K au contraire, il apparaît deux composantes magnétiques d'intensités pratiquement égales mais de champs internes et déplacements isomériques différents. Les différences s'atténuent lorsque la concentration en Sn augmente.
Abstract
A Mössbauer effect study on the Ca1-xSrxFeO3 (0 ≤ x ≤ 0.75) system shows a charge disproportionation 2Fe4+ → "Fe3+" + "Fe5+" below the antiferromagnetic transition temperatures. At room temperature, each oxide shows a slightly broad symmetric absorption, but the spectrum at 4 K consists of two kinds of magnetic patterns with nearly equal intensities but with different CS's and Hi's. Both the differences, or the difference between the electronic states of the two kinds of Fe ions, decrease with increasing Sr-content.