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Oxygen transport in La0.6Sr0.4Co1−y Fe y O3−δ

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Abstract

The surface exchange coefficient and chemical diffusion coefficient of oxygen for the perovskites La0.6Sr0.4Co1−y Fe y O3−δ (y=0.2, 0.5 and 0.8) were measured using the conductivity relaxation technique. Measurements were performed between 600 and 800 °C in an oxygen partial pressure range between 10−4 and 1 bar. Both transport coefficients decrease markedly with decreasing oxygen partial pressure below about 10−2 bar at all temperatures. This is attributed to ordering of oxygen vacancies. Implications for using La0.6Sr0.4Co1−y Fe y O3−δ as an oxygen separation membrane are discussed.

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Authors and Affiliations

  1. Department of Science & Technology, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE , Enschede, The Netherlands

    H. J. M. Bouwmeester, M. W. Den Otter & B. A. Boukamp

Authors
  1. H. J. M. Bouwmeester
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  2. M. W. Den Otter
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  3. B. A. Boukamp
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Corresponding author

Correspondence to H. J. M. Bouwmeester.

Additional information

Presented at the OSSEP Workshop “Ionic and Mixed Conductors: Methods and Processes”, Aveiro, Portugal, 10-12 April 2003

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Bouwmeester, H.J.M., Den Otter, M.W. & Boukamp, B.A. Oxygen transport in La0.6Sr0.4Co1−y Fe y O3−δ . J Solid State Electrochem 8, 599–605 (2004). https://doi.org/10.1007/s10008-003-0488-3

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  • DOI: https://doi.org/10.1007/s10008-003-0488-3

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