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Dimensional stability and defect chemistry of doped lanthanum chromites

  • Inorganic Compounds
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Abstract

Acceptor doped lanthanum chromites are potential interconnect materials to be used in high temperature Solid Oxide Fuel Cells (SOFC). However, instability of these materials when exposed to low oxygen partial pressure causes a volume expansion that can be detrimental to the SOFC performance. The stability of La0.8Sr0.2Cr0.97V0.03O3 is determined as function ofpO2 and temperature by isothermal thermogravimetry and dilatometry. The experimental data are analysed using a simple model for the defect chemistry. The relation between expansion behaviour and change in defect chemistry is discussed using a simple structural model.

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Authors and Affiliations

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

    P. H. Larsen, P. V. Hendriksen & M. Mogensen

Authors
  1. P. H. Larsen
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  2. P. V. Hendriksen
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  3. M. Mogensen
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Additional information

This work was supported by the Danish Energy Agency and ELSAM under the DK-SOFC programme. Dr. T. R. Armstrong, The Pacific Northwest Laboratory is thanked for valuable discussions.

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Larsen, P.H., Hendriksen, P.V. & Mogensen, M. Dimensional stability and defect chemistry of doped lanthanum chromites. Journal of Thermal Analysis 49, 1263–1275 (1997). https://doi.org/10.1007/BF01983683

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  • DOI: https://doi.org/10.1007/BF01983683

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