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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.

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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