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Interphase exchange and diffusion of oxygen in lanthanum-strontium cobaltites doped with iron

  • Physical Chemistry of Surface Phenomena
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Abstract

Oxides La0.4Sr0.6Co1 − x Fe x O3 − δ (x = 0.2 and 0.4) were synthesized by the ceramic technology. The kinetics of exchange and diffusion of oxygen in these oxides were studied by the isotopic exchange method over the temperature range 600–900°C at an oxygen pressure of 10 torr. The temperature dependences of interphase exchange rate and oxygen diffusion coefficient in the bulk and near-surface region were obtained, and the effective activation energies of exchange and oxygen diffusion were calculated. The concentration of iron ions was shown to have no substantial influence on the exchange rate and oxygen diffusion. Ratio between the values of exchange rate and diffusion coefficient were shown to influent on the precision of the values estimation.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia

    M. V. Ananyev & E. Kh. Kurumchin

Authors
  1. M. V. Ananyev
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  2. E. Kh. Kurumchin
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Correspondence to M. V. Ananyev.

Additional information

Original Russian Text © M.V. Ananyev, E.Kh. Kurumchin, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 6, pp. 1152–1157.

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Ananyev, M.V., Kurumchin, E.K. Interphase exchange and diffusion of oxygen in lanthanum-strontium cobaltites doped with iron. Russ. J. Phys. Chem. 84, 1039–1044 (2010). https://doi.org/10.1134/S0036024410060269

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  • DOI: https://doi.org/10.1134/S0036024410060269

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