Yttrium doped BSCF membranes for oxygen separation

P. Haworth, S. Smart, Julie Glasscock, J.C. Diniz da Costa

    Research output: Contribution to journalJournal articleResearchpeer-review


    This work investigates the partial substitution of yttrium in place of iron in BSCF to form Ba0.5Sr0.5Co0.8Fe0.2−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.
    Original languageEnglish
    JournalSeparation and Purification Technology
    Issue number1
    Pages (from-to)88-93
    Publication statusPublished - 2011


    • Membranes


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