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Electrical Conductivity in Praseodymium-Cerium Oxide

Published online by Cambridge University Press:  11 February 2011

Todd S. Stefanik  and
Harry L. Tuller
Todd S. Stefanik
Affiliation:
Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Harry L. Tuller
Affiliation:
Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

The electrical conductivity of PrxCe1-xO2-δ (PCO) for 0 ≤ × ≤ 0.20 was examined over a wide range of temperatures and oxygen partial pressures. A defect model based on multiple Pr valence states was found to be qualitatively consistent with the observed data. A unique pO2-dependent ionic conductivity is observed at high pO2 values in compositions containing low levels of Pr (0 ≤ × ≤ 0.01). In compositions containing higher amounts of Pr (0.05 ≤ × ≤ 0.20), formation of a Pr induced impurity band results in a significant electronic conductivity at high pO2 values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE10.8
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

1. Schneider, D., Godickemeier, M. and Gauckler, L. J., Nonstoichiometry and defect chemistry of ceria solid solutions, Journal of Electroceramics, 1, 165–172 (1997).Google Scholar
2. Nauer, M., Ftikos, C. and Steele, B. C. H., An evaluation of Ce-Pr oxides and Ce-Pr-Nb oxides mixed conductors for cathodes of solid oxide fuel cells: structure, thermal expansion and electrical conductivity, Journal of the European Ceramic Society, 14, 493–499 (1994).Google Scholar
3. Bouwmeester, H. J. M. and Burggraaf, A. J., in The CRC Handbook of Solid State Electrochemistry 481–534 (CRC Press, Inc., 1997).Google Scholar
4. Knauth, P. and Tuller, H. L., Nonstoichiometry and relaxation kinetics of nanocrystalline mixed praseodymium-cerium oxide Pr0.7Ce0.3O2-x , Journal of the European Ceramic Society, 19, 831–836 (1998).Google Scholar
5. Stefanik, T. S. and Tuller, H. L., Ceria-based gas sensors, Journal of the European Ceramic Society, 21, 1967–1970 (2001).Google Scholar
6. Jones, J. A. and Blue, G. D., Oxygen chemisorption compressor study for cryogenic Joule-Thompson refrigeration, Journal of Spacecraft, 25, 202–208 (1988).Google Scholar
7. Takasu, Y., Sugino, T. and Matsuda, Y., Electrical conductivity of praseodymia doped ceria, Journal of Applied Electrochemistry, 14, 79–81 (1984).Google Scholar
8. Shuk, P. and Greenblatt, M., Hydrothermal synthesis and properties of mixed conductors based on Ce1-xPrxO2-δ solid solutions, Solid State Ionics, 116, 217–223 (1999).Google Scholar
9. Porat, O. and Tuller, H. L., Simplified analytical treatment of defect equilibria: applications to oxides with multivalent dopants, Journal of Electroceramics, 1, 41–49 (1997).Google Scholar
10. Tuller, H. L. and Nowick, A. S., Small polaron electron transport in reduced CeO2 single crystals, Journal of Physics and Chemistry of Solids, 38, 859–867 (1976).Google Scholar
11. Steele, B. C. H., Appraisal of Ce1-yGdyO2-y/2 electrolytes for IT_SOFC operation at 500°C, Solid State Ionics, 129, 95–110 (2000).Google Scholar