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Effects of Small Deviations from Stoichiometry on Grain Boundary Compositions in YBa2Cu3O7-x

Published online by Cambridge University Press:  26 February 2011

D. M. Kroeger ,
J. Brynestad ,
R. K. Williams ,
R. A. Padgett  and
J. O. Scarbrough
D. M. Kroeger
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
J. Brynestad
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. K. Williams
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
R. A. Padgett
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
J. O. Scarbrough
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

Comparison of Auger electron spectra for intergranular and transgranular areas on fracture surfaces of sintered YBa2Cu3O7-x indicates the presence of a grain-boundary layer which is copper-rich and oxygen-poor compared to the bulk. This layer is believed to be an important factor limiting the critical current density in sintered material. The composition of the grain-boundary layer is strongly affected by small changes in sample composition, as might be expected for a line compound. These small deviations from the stoichiometric composition also affect the critical current density and the electrical resistivity above the transition temperature.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 521
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCE

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