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Reactivity of the perovskite system Ca1– x Sr x FeO2.5 in topotactic electrochemical oxidation at ambient temperature

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Abstract.

Electrochemical galvanostatic oxidation of strontium-substituted CaFeO2.5 at room temperature in an alkaline electrolyte is described. Samples with nominal composition Ca1– x Sr x FeO2.5 were completely oxidized to the cubic perovskite at x≥0.25. The substitution at this level is accompanied by phase separation with formation of Ca- and Sr-enriched microdomains and a sharp increase in the reactivity of the matrix. The study confirms the phenomenological model which describes an anomalous rapid oxidation process in perovskites for such a low temperature as a result of long-range fast oxygen transport along microdomain walls, followed by slow diffusion over short distances in defect-free domains.

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Science, Kutateladze 18, 630128 Novosibirsk, Russia, Russia

    Alexander Nemudry, Andrey Rogatchev & Igor Gainutdinov

  2. Institut für Anorganische und Analytische Chemie, Technische Universität Berlin, 10623 Berlin, Germany, Germany

    Robert Schöllhorn

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  1. Alexander Nemudry
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  2. Andrey Rogatchev
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  3. Igor Gainutdinov
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  4. Robert Schöllhorn
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Correspondence to Alexander Nemudry.

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Nemudry, A., Rogatchev, A., Gainutdinov, I. et al. Reactivity of the perovskite system Ca1– x Sr x FeO2.5 in topotactic electrochemical oxidation at ambient temperature. J Solid State Electrochem 5, 450–458 (2001). https://doi.org/10.1007/s100080000188

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  • DOI: https://doi.org/10.1007/s100080000188

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