Abstract
A stable and high oxygen permeable membrane system has been developed via partial replacement of iron with zirconium in SrCo0.8Fe0.2O3−δ compound. The initial powder series of composition SrCo0.8Fe0.2−yZryO3−δ (0 ≤ y ≤ 0.1), synthesized by an oxalate-based sol-gel route, is shown to exhibit a single perovskite-type cubic phase at 27 °C, transform to a brownmillerite (Ca2AlFeO5)-type orthorhombic structure, and finally assume a stable open cubic phase with disordered oxygen vacancies at temperatures determined by zirconium content, transitions being at 200 and 800 °C, respectively for the system y = 0.05. The highest JO2 of 2.54 × 10−6 mol cm−2 s−1 is realized in optimum composition of y = 0.05 at 1000 °C. The formation of cubic phase in Sr–Co–Fe–O system with abundance of disordered anion vacancies is crucial for both the high oxygen permeability and extended operational stability at elevated temperatures.
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Kashyap, V.K., Jaiswal, S.K. & Kumar, J. Effect of Zr4+on the phase stability and oxygen permeation characteristics of SrCo0.8Fe0.2−yZryO3−δ (y ≤ 0.1) membranes. Ionics 26, 1895–1911 (2020). https://doi.org/10.1007/s11581-019-03393-8
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DOI: https://doi.org/10.1007/s11581-019-03393-8