Preparation and Characterization of Pr-Sr-Co-Fe-Al-O Based Perovskite Oxides for SOFC Cathodes

  1. Dr. K. Grassie2,
  2. Prof. Dr. E. Teuckhoff3,
  3. Prof. Dr. G. Wegner4,
  4. Prof. Dr. J. Hausselt5 and
  5. Prof. Dr. H. Hanselka6
  1. F. Riza,
  2. G. Ch. Kostogloudis and
  3. Ch. Ftikos

Published Online: 27 APR 2006

DOI: 10.1002/3527607420.ch33

Functional Materials, Volume 13

Functional Materials, Volume 13

How to Cite

Riza, F., Kostogloudis, G. Ch. and Ftikos, Ch. (2000) Preparation and Characterization of Pr-Sr-Co-Fe-Al-O Based Perovskite Oxides for SOFC Cathodes, in Functional Materials, Volume 13 (eds K. Grassie, E. Teuckhoff, G. Wegner, J. Hausselt and H. Hanselka), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607420.ch33

Editor Information

  1. 2

    Philips Forschungslaboratorium, Postfach 500145, 52085 Aachen, Germany

  2. 3

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

  3. 4

    Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

  4. 5

    Forschungszentrum Karlsruhe, Postfach 3640, 76201 Karlsruhe, Germany

  5. 6

    Institut für Mechanik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39160 Magdeburg, Germany

Author Information

  1. National Technical University of Athens, Greece

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527302543

Online ISBN: 9783527607426

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Keywords:

  • functional materials;
  • Pr-Sr-Co-Fe-Al-O based perovskite oxides for SOFC cathodes;
  • preparation;
  • characterization

Summary

The influence of up to 40 mol% Al substitution for Fe on the properties of the perovskite oxides (Pr1-xSrx)(Co0.2Fe0.8)O3-δ (x = 0.1, 0.3) was studied. The oxides were prepared by citrate synthesis and characterized by X-ray diffraction, dilatometry and 4-point DC. The above oxides had an orthorhombic perovskite structure, with the exception of (Pr0.7Sr0.3)(Co0.2Fe0.4Al0.4)O3-δ, which had the cubic structure. The lattice parameters were determined from the room temperature XRD data, using the LSUCR computer program. In general the unit cell volume decreased with increasing Al content, due to the larger size of Al3+ cation compared to that of Fe3+. The linear thermal expansion coefficient (TEC) at 700°C decreased as Al content increased. The electrical conductivity decreased with increasing Al content. From the above oxides, (Pr0.7Sr0.3)(Co0.2Fe0.6Al0.2)O3-δ, with proper tailoring of composition, seems to be the most suitable material for use as SOFC cathode. Its TEC value was 14.5 × 10−6 cm (cm °C)−1, while its electrical conductivity had a value of 80 S cm−1 at 700 °C.