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    Optimization of BaxSr1-xCo0.9Nb0.1O3-8 perovskite as oxygen semi-permeable membranes by compositional tailoring

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    Fulltext not available
    Authors
    Zhao, J.
    Zhang, K.
    Gao, D.
    Shao, Zongping
    Liu, Shaomin
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhao, J. and Zhang, K. and Gao, D. and Shao, Z. and Liu, S. 2010. Optimization of BaxSr1-xCo0.9Nb0.1O3-8 perovskite as oxygen semi-permeable membranes by compositional tailoring. Separation and Purification Technology. 71 (2): pp. 152-159.
    Source Title
    Separation and Purification Technology
    DOI
    10.1016/j.seppur.2009.11.014
    ISSN
    13835866
    URI
    http://hdl.handle.net/20.500.11937/13384
    Collection
    • Curtin Research Publications
    Abstract

    Mixed conducting SrCo0.9Nb0.1O3−δ perovskite is a newly developed promising ceramic membrane material for air separation. In this work, SrCo0.9Nb0.1O3−δ was further optimized by the introduction of Ba to partially replace Sr in the A-site of the perovskite structure. The phase structure, phase stability, carbonate formation rate under carbon dioxide atmosphere, electrical conductivity, oxygen desorption properties, and oxygen permeation properties of BaxSr1−xCo0.9Nb0.1O3−δ (BSCNx) with varying Ba2+ doping level were systematically investigated. Pure phase cubic perovskite was formed at x = 0.0–0.8. BSCNx (x = 0.0–0.8) can be stably operated in atmospheres with oxygen partial pressure varying from at least 1 atm to as low as 10−5 atm (Ar atmosphere). The barium doping concentration had a significant effect on electrical conductivity and oxygen permeability of the membranes. BSCN0.6 had the highest oxygen permeation flux of 2.67 × 10−6 mol cm−2 s−1 for 0.87 mm thickness at 900 °C and the highest oxygen ionic conductivity of 1.38 S cm−1 at 900 °C.

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