This work investigates the partial substitution of yttrium in place of iron in BSCF to form Ba0.5Sr0.5Co0.8Fe 0.2-xYxO3-δ, where x varied between 0 and 0.2. X-ray diffraction patterns showed the formation of a perovskite cubic phase structure up to x = 0.15, whilst the full substitution of yttrium (x = 0.2) for iron resulted in a non-cubic crystal structure that did not exhibit oxygen permeation. The yttrium partial substitution in BSCFY discs (1.2 mm thick) delivered best results for x = 0.025, as oxygen fluxes reached 2.05 ml cm-2 min-1 at 900 °C, an increase of 160% as compared to a blank BSCF (x = 0) membrane. This was attributed to the combined effect of the formation of a greater number of oxygen vacancies, together with improved ion mobility, associated with the beneficial yttrium substitution into the BSCF perovskite structure which stemmed from the crystal lattice expansion. © 2011 Elsevier B.V. All rights reserved.
CITATION STYLE
Haworth, P., Smart, S., Glasscock, J., & Diniz Da Costa, J. C. (2011). Yttrium doped BSCF membranes for oxygen separation. Separation and Purification Technology, 81(1), 88–93. https://doi.org/10.1016/j.seppur.2011.07.007
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