Using "gSn'V as a diamagnetic probe in the perovskite lattice of AFeO, oxides (A=Ca, Sr), the Fe" disproportionation (2Fe"'$Fe"' + FeV) is discussed. An electronic phenomenon previously described for CaFeO, is detected in SrFeO, due to the local breakdown of the electronic delocalisation. Steric interactions seem to be the predominant factor for explaining the oxidation state of iron in the Sn" environment.
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