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.
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Takano et al. (1979) studied this question.