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Effects of Microstructure on Oxygen Permeation in Some Perovskite Oxides

Published online by Cambridge University Press:  10 February 2011

K. Zhang ,
Y. L. Yang ,
A. J. Jacobson  and
K. Salama
K. Zhang
Affiliation:
Materials Research Science and Engineering Center, University of Houston Houston, TX 77204
Y. L. Yang
Affiliation:
Materials Research Science and Engineering Center, University of Houston Houston, TX 77204
A. J. Jacobson
Affiliation:
Materials Research Science and Engineering Center, University of Houston Houston, TX 77204
K. Salama
Affiliation:
Materials Research Science and Engineering Center, University of Houston Houston, TX 77204
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Abstract

The effects of microstructure on the oxygen permeation in SrCo0.8Fe0.2O3-δ(SCFO) and La0.2 Sr0.8 Fe0.8Cr0.2 O3 (LSFCO) was investigated using disc samples fabricated under different processing conditions. The microstructure of LSFCO remained unchanged when the sintering temperature was increased from 1300 to 1450 °C, but the average grain size of SCFO increased considerably when the sintering temperature was increased from 930 to 1200 °C. The change in grain size was found to have a strong effect on the oxygen permeation flux in SCFO, which increased considerably as the grain size was decreased. This indicates that the contribution of the grain boundary diffusion to the steady state oxygen flux in SCFO is substantial and grain boundaries provide faster diffusion paths in oxygen permeation through the samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 341
Copyright
Copyright © Materials Research Society 1998

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References

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