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    Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation

    Access Status
    Fulltext not available
    Authors
    Xu, D.
    Dong, F.
    Chen, Y.
    Zhao, B.
    Liu, Shaomin
    Tade, Moses
    Shao, Zongping
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Xu, D. and Dong, F. and Chen, Y. and Zhao, B. and Liu, S. and Tade, M. and Shao, Z. 2014. Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation. Journal of Membrane Science. 455: pp. 75-82.
    Source Title
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2013.12.030
    ISSN
    0376-7388
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/41127
    Collection
    • Curtin Research Publications
    Abstract

    Cobalt-free perovskite-type oxides with the nominal composition of BaNbyFe1−yO3−δ (y=0.025–0.20) are synthesized and evaluated as materials used in ceramic membranes for oxygen separation. The effects of Nb-doping on the crystal structure, surface morphology, electrical conductivity, chemical bulk diffusion and surface exchange, and oxygen permeability of the oxides are systematically investigated using XRD, SEM, four-probe DC conductivity, electrical conductivity relaxation technique, and oxygen permeation studies. A small amount of Nb-doping induces a sharp increase in electrical conductivity. A further increase in the Nb-doping amount, however, lowers the electrical conductivity as a result of the blocking effect of Nb5+ on electronic conduction. A small amount of Nb-doping has less impact on the sintering capability. From the oxygen permeation test, it was found that Nb-doping could significantly enhance the oxygen permeability, especially below 750 °C. Among all of the compositions, BaNb0.05Fe0.95O3−δ shows the highest oxygen permeation fluxes, reaching 1.35 and 0.61 mL cm−2 min−1 for a membrane with a thickness of 1.0 mm at 900 and 700 °C, respectively. Furthermore, the membrane is rate-controlled mainly by bulk diffusion, indicating the potential to further improve the oxygen permeation flux via a thinner membrane.

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