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Bi 1−x Sr x FeO 3−δ perovskites synthesised by solid-state reaction in ambient atmosphere or in a closed vessel were analysed by X-ray diffraction and Mössbauer spectroscopy. The evolution of the valence state of iron with both Bi/Sr ratio and oxygen content has been more particularly discussed. The samples are single phase and homogeneous for x ≤ 0.5 (Bi-rich) and x > 0...
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