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Electronic Behavior of Ba0.5Sr0.5Co0.8Fe0.2O3-d and SrCo0.9Nb0.1O3-d

Published online by Cambridge University Press:  20 September 2011

Robert E. Usiskin ,
Richard Y. Wang  and
Sossina M. Haile
Robert E. Usiskin
Affiliation:
Materials Science, California Institute of Technology, Pasadena, CA 91125
Richard Y. Wang
Affiliation:
Materials Science, California Institute of Technology, Pasadena, CA 91125
Sossina M. Haile
Affiliation:
Materials Science, California Institute of Technology, Pasadena, CA 91125
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Abstract

The perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-d (BSCF 5582) has attracted great interest as an oxygen reduction catalyst for solid oxide fuel cells and as an oxygen permeation membrane material. Mixed ionic and electronic conductivity is essential to the high catalytic activity it exhibits, however its electronic behavior and overall defect chemistry are not well understood. The related material SrCo0.9Nb0.1O3-d (SCN 091) is another promising composition that may have comparable performance, but with defect chemistry that is simpler to study. From a combination of thermogravimetric, impedance, and diffraction measurements we find SCN 091 to exhibit somewhat smaller oxygen nonstoichiometry, five times higher electronic conductivity, lower enthalpy of hole migration, and greater structural stability than BSCF 5582. We also observe that the enthalpy of hole migration in such materials tends to increase as oxygen content decreases; the origins of this behavior are unclear.

Keywords

electronic structurethermogravimetric analysis (TGA)ionic conductor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1331: Symposium K – Frontiers of Solid-State Ionics , 2011 , mrss11-1331-k07-08
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

[1] Shao, Z. and Haile, S. M., Nature 431 (2004) 170.Google Scholar
[2] Zhou, W., Shao, Z., Ran, R., Jin, W., and Xu, N., Chem. Commun. (2008) 5791.Google Scholar
[3] Arnold, M., Gesing, T., and Martynczuk, J., Chemistry of Materials (2008)Google Scholar
[4] Kriegel, R., Kircheisen, R., and Töpfer, J., Solid State Ionics 181 (2010) 64.Google Scholar
[5] Švarcová, S., Wiik, K., Tolchard, J., Bouwmeester, H., and Grande, T., Solid State Ionics 178 (2008) 1787.Google Scholar
[6] Mueller, D. N., De Souza, R. A., Weirich, T. E., Roehrens, D., Mayer, J., and Martin, M., Phys Chem Chem Phys 12 (2010) 10320.Google Scholar
[7] Yang, Z. and Lin, Y., Solid State Ionics 150 (2002) 245.Google Scholar
[8] Liu, L., Lee, T., Qiu, L., Yang, Y., and Jacobson, A., Materials Research Bulletin 31 (1996) 29.Google Scholar
[9] Zhou, W., Jin, W., Zhu, Z., and Shao, Z., International Journal of Hydrogen Energy 35 (2010) 1356.Google Scholar
[10] Bucher, E., Egger, A., Ried, P., Sitte, W., and Holtappels, P., Solid State Ionics 179 (2008) 1032.Google Scholar
[11] MCINTOSH, S., VENTE, J., HAIJE, W., BLANK, D., and BOUWMEESTER, H., Chemistry of Materials 18 (2006) 2187.Google Scholar
[12] Lai, W. and Haile, S. M., J American Ceramic Society 88 (2005) 2979.Google Scholar
[13] Adler, S., Chemical reviews (2004)Google Scholar
[14] Chen, Z., Ran, R., Zhou, W., Shao, Z., and Liu, S., Electrochimica Acta 52 (2007) 7343.Google Scholar
[15] Tilley, R. J. D., Defect Crystal Chemistry (1987) 128.Google Scholar
[16] Mizusaki, J., Mima, Y., Yamauchi, S., Fueki, K., and Tagawa, H., Journal of Solid State Chemistry 80 (1989) 102.Google Scholar
[17] Kharton, V., Tsipis, E., Yaremchenko, A., Marozau, I., Viskup, A., Frade, J., and Naumovich, E., Materials Science and Engineering: B 134 (2006) 80.Google Scholar