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Oxygen transport in La0.5Sr0.5Fe1−yTiyO3−δ (y=0.0, 0.2) membranes

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Abstract

The influence of partial substitution of Fe with Ti on the oxygen transport properties of La1−x Sr x FeO3 membranes was investigated in view of their application for oxygen separation. Samples of composition \( La_{{0.5}} Sr_{{0.5}} {\text{Fe}}_{{1 - y}} {\text{Ti}}_{y} {\text{O}}_{{3 - \delta }} \) (y=0, 0.2) were prepared and their oxygen transport properties characterised by potential step relaxation and by oxygen permeation measurement in an air/argon gradient. With the first technique, chemical diffusion \({( {\widetilde{D}} )}\)and surface exchange (k S) coefficients were obtained by fitting of the current relaxation data to a single expression valid over the complete time range. The Ti-substituted composition gave slightly larger values of \({\widetilde{D}}\) and k S. The trend was opposite for the measured oxygen permeation flux. In the latter experience, ordering of oxygen vacancies was observed at lower temperature, reducing significantly the performance of the material.

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Acknowledgement

This work was supported by the Swiss National Science Foundation (Project nos. 200021-100674/1 and 200020-109643/1).

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Authors and Affiliations

  1. Laboratory for High Performance Ceramics, Empa Materials Science and Technology, Ueberlandstr. 129, 8600, Dübendorf, Switzerland

    Defne Bayraktar, Peter Holtappels & Thomas Graule

  2. HTceramix SA, av. des Sports 26, 1400, Yverdon-les-Bains, Switzerland

    Stefan Diethelm

  3. Laboratory for Industrial Energy Systems (LENI), STI, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland

    Jan Van herle

Authors
  1. Defne Bayraktar
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  2. Stefan Diethelm
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  3. Peter Holtappels
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  4. Thomas Graule
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  5. Jan Van herle
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Correspondence to Stefan Diethelm.

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Bayraktar, D., Diethelm, S., Holtappels, P. et al. Oxygen transport in La0.5Sr0.5Fe1−yTiyO3−δ (y=0.0, 0.2) membranes. J Solid State Electrochem 10, 589–596 (2006). https://doi.org/10.1007/s10008-006-0133-z

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  • DOI: https://doi.org/10.1007/s10008-006-0133-z

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