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Synthesis and properties of Sr1 − x M x Co0.8 − y Al y Fe0.2O3 − z perovskite-like oxides

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Abstract

Partial isomorphous substitutions on the strontium and cobalt sites in the SrCo0.8Fe0.2O3 − z perovskite have been shown to have a significant effect on its properties. Aluminum substitution for cobalt suppresses the brownmillerite-perovskite structural phase transition, stabilizes the cubic perovskite structure in a wide range of oxygen stoichiometries, and markedly enhances the thermal stability of the material in reducing atmospheres, without reducing the oxygen mobility. Partial lanthanum and calcium substitutions for strontium lead to the formation of Sr1 − x M x Co0.5Al0.3Fe0.2O3 − z (M = La, Ca) perovskite-like oxides, which have cubic and orthorhombic structures, respectively. The Sr1 − x La x Co0.5Al0.3Fe0.2O3 − z perovskites possess high chemical stability in reducing atmospheres and are potentially attractive as materials for oxygen-permeable membranes of catalytic methane-to-syngas conversion reactors.

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Authors and Affiliations

  1. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    E. B. Pyatiletova, A. P. Nemudry & N. Z. Lyakhov

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  1. E. B. Pyatiletova
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  2. A. P. Nemudry
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  3. N. Z. Lyakhov
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Correspondence to A. P. Nemudry.

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Original Russian Text © E.B. Pyatiletova, A.P. Nemudry, N.Z. Lyakhov, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 10, pp. 1262–1269.

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Pyatiletova, E.B., Nemudry, A.P. & Lyakhov, N.Z. Synthesis and properties of Sr1 − x M x Co0.8 − y Al y Fe0.2O3 − z perovskite-like oxides. Inorg Mater 43, 1134–1141 (2007). https://doi.org/10.1134/S0020168507100184

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  • DOI: https://doi.org/10.1134/S0020168507100184

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