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Grain Boundaries, Planar Defects and Superconducting Properties of YBa2Cu3O7

Published online by Cambridge University Press:  28 February 2011

J. Tafto ,
M. Suenaga ,
T. Wang ,
R. L. Sabatini ,
A. R. Moodenbaugh  and
S. Levine
J. Tafto
Affiliation:
Division of Materials Science, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973
M. Suenaga
Affiliation:
Division of Materials Science, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973
T. Wang
Affiliation:
Division of Materials Science, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973 Department of Materials Science, State University of New York at Stony Brook, Stony Brook, NY 11790
R. L. Sabatini
Affiliation:
Division of Materials Science, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973
A. R. Moodenbaugh
Affiliation:
Division of Materials Science, Department of Applied Science, Brookhaven National Laboratory, Upton, NY 11973
S. Levine
Affiliation:
Department of Materials Science, State University of New York at Stony Brook, Stony Brook, NY 11790
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Abstract

Polycrystalline samples of tetragonal YBa2Cu3O6.25 were transformed into the superconducting orthorhombic phase by annealing in an oxygen atmosphere at temperatures ranging from 400–850°C and then slowly cooled to room temperature (15°C/h). Transmission electron microscopy (TEM) images of these samples and samples prepared in the usual way show layers of amorphous or highly disordered material, several 100 nm thick, at a large fraction of the grain boundaries. Also all samples contain 10–100 nm thick sheets of disordered material which lie in the a-b planes and tend to run through the entire crystal grain. In the a-b planes we also observe dislocation loops, particularly in the as-quenched tetragonal samples and stacking faults in the heat-treated samples. We also frequently observe set of twins with orthogonal habit planes within a crystal grain. We attribute the low critical current density in YBa2Cu3O7 to these planar faults and the disordered grain boundary regions, and discuss the TEM observations with reference to resistivity and inductive measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 511
Copyright
Copyright © Materials Research Society 1988

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References

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