Abstract
Doping of SrFeO2.5 with Мо6+ ions is accompanied by nanostructuring with the formation of 90° domains 10–20 nm in size with brownmillerite structure, as confirmed by X-ray diffraction, high-resolution electron microscopy, and Mössbauer spectroscopy. The evolution of the microstructure of SrFe1 − x Mo x O2.5 + 3/2x with temperature at low oxygen partial pressure was investigated by means of high-temperature X-ray diffraction; it was shown that nanodomain texture is stable to at least T ∼ 800 °C. Chronopotentiometry and permeability measurements demonstrate that the title compounds possess high oxygen mobility within a wide temperature range: oxygen diffusion coefficients at ambient temperatures are D = 10−13–10−12 cm2/s and oxygen fluxes at 960 °C for SrFeO3 − z (L = 1.42 mm) and SrFe0.95Mo0.05O3 − z (L = 1.5 mm) membranes in air/He gradient reach 0.25 and 0.19 μmol/(cm2 min), respectively.
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Acknowledgements
The authors are grateful to A. Ischenko and A. Nadeev (Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia) for performing HREM and high-temperature XRD measurements. The work was supported by RFBR Project No. 08-03-00738, Integration projects SB RAS (No. 82), and Presidium RAS (No. 27.54).
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Dedicated to Prof. R. Schöllhorn on his 75th birthday
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Savinskaya, O., Nemudry, A.P. Oxygen transport properties of nanostructured SrFe1 − x Mo x O2.5 + 3/2x (0 < x < 0.1) perovskites. J Solid State Electrochem 15, 269–275 (2011). https://doi.org/10.1007/s10008-010-1109-6
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DOI: https://doi.org/10.1007/s10008-010-1109-6