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Resistivity relaxation, a new approach to study ionic mobility in perovskite mixed conductors like CaTi0.7Fe0.3O3–δ

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Abstract

Oxygen transport of mixed ionic-electronic conductors can be measured by a ‘relaxation’ technique that permits to investigate the material dynamic properties with oxygen partial pressure change. However, for materials exhibiting higher electronic conductivity than ionic, the time for conductivity change is controlled by bulk ionic transport and any surface reaction can be neglected. By fitting the experimental relaxation data of CaTi0.7Fe0.3O3–δ composition, the oxidation and reduction kinetics was found to be independent on oxygen partial pressure (\(P_{O_2 } \)) and the rate constants were derived therefrom. From a relaxation experiment at a single\(P_{O_2 } \) we therefore obtain both the electronic and ionic contributions to the total conductivity as well as the chemical diffusion coefficient.

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Authors and Affiliations

  1. Lehrstuhl für Kristallographie und Strukturphysik, Universität Erlangen-Nürnberg, D-91058, Erlangen, Germany

    E. Mashkina, M. Baier & A. Magerl

  2. Lehrstuhl für Mineralogie, Universität Erlangen-Nürnberg, D-91054, Erlangen, Germany

    M. Göbbels

  3. Bayerisches Geoinstitut, Universität Bayreuth, D-95440, Bayreuth, Germany

    F. Seifert

Authors
  1. E. Mashkina
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  2. M. Baier
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  3. A. Magerl
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  4. M. Göbbels
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  5. F. Seifert
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Mashkina, E., Baier, M., Magerl, A. et al. Resistivity relaxation, a new approach to study ionic mobility in perovskite mixed conductors like CaTi0.7Fe0.3O3–δ . Ionics 11, 269–274 (2005). https://doi.org/10.1007/BF02430388

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  • DOI: https://doi.org/10.1007/BF02430388

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