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Results of X-ray, Mössbauer and thermogravimetric studies per formed for SrCo0.2Fe0.8O3-delta oxide are presented. The initial “as prepared”, vacancy ordered, orthorhombic SrCo0.2Fe0.8O2.75 upon reduction at high temperatures in low hydrogen content, H2/Ar gas mixture, transforms into brownmillerite type SrCo0.2Fe0.8O2.5. While heating in air, at around 400 graduate C, SrCo0.2Fe0.8O2.5 transforms...
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