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• W2023232777 abstract "Substituted perovskite-type mixed oxides of the general formula La1−xSrx(Fe3+/Fe4+)O3±δ were prepared for x=0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, and 0.90 by the ceramic method and heating at 1000 °C. The prepared solids were examined by X-ray diffractogram (XRD) for their crystal structure and by Mössbauer spectroscopy at RT for the kind and the exact amount of iron containing crystal phases. The gradual substitution of La3+ by Sr2+ results in a quantitative development of the crystal phase SrFe4+O3 and the corresponding diminution of the rest phases containing iron, i.e. LaFeO3 and Fe2O3 (traces). Detailed thermogravimetric O2/temperature-programmed desorption (TPD) experiments showed that the solids release oxygen when heated in a He atmosphere which is strictly proportional to the amount of Fe4+ in the samples. Quantitative calculations showed that exactly one atom of oxygen is released per unit cell of Sr–Fe–O perovskite, which contains four Sr(Fe4+/Fe3+)O3±δ units. The phenomenon is reversible and the solids re-adsorb fast and quantitatively the lost lattice oxygen when gaseous oxygen is admitted back to the system." @default.
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• W2023232777 date "2003-02-01" @default.
• W2023232777 modified "2023-10-18" @default.
• W2023232777 title "Reverse uptake of oxygen from La1−xSrx (Fe3+/Fe4+)O3±δ perovskite-type mixed oxides (x = 0.00, 0.15, 0.30, 0.40, 0.60, 0.70, 0.80, 0.90)" @default.
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• W2023232777 doi "https://doi.org/10.1016/s0926-860x(02)00458-1" @default.
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