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Determination of The Oxygen Chemical Diffusion Coefficient in Perovskites by a Thermogravimetric Method

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Abstract

A thermogravimetric method has been used for the determination of the oxygen chemical diffusion coefficients in La1–xSrxMnO3+δ; x=0; 0.05; 0.10; 0.15 (LSM).

A temperature range of 700–1000°C was studied.

The chemical diffusion coefficient varies between 1.6⋅10–13 and 1.8⋅10–10cm2s–1 for the samples in the temperature range studied. The activation energy for oxygen chemical diffusion was determined to be 190–280 kJ mol–1 for the LSM samples. The magnitude of the chemical diffusion coefficients of the LSM samples does not depend on the strontium site occupation factor.

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Authors and Affiliations

  1. Materials Research Department, Risø National Laboratory, DK-4000, Roskilde, Denmark

    L. Mikkelsen

  2. Department of Chemistry, University of Southern Denmark, Denmark

    E. Skou

  3. Odense University, DK-5230, Odense, Denmark

    E. Skou

Authors
  1. L. Mikkelsen
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  2. E. Skou
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Mikkelsen, L., Skou, E. Determination of The Oxygen Chemical Diffusion Coefficient in Perovskites by a Thermogravimetric Method. Journal of Thermal Analysis and Calorimetry 64, 873–876 (2001). https://doi.org/10.1023/A:1011542123348

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