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Structure of grain boundaries: Correlation to supercurrent transport in textured Bi2Sr2Can−1CunOx bulk material

Published online by Cambridge University Press:  31 January 2011

Y. Yan ,
M. A. Kirk  and
J. E. Evetts
Y. Yan
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
M. A. Kirk
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
J. E. Evetts
Affiliation:
IRC in Superconductivity, Cambridge University, Madingley Road, Cambridge CB3 0HE, United Kingdom
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Abstract

Two kinds of characteristic grain boundaries were observed in textured Bi2Sr2Can−1CunOx (n = 2 and 3) bulk material: one (P-type) is nearly parallel to the (001) plane, and the other (N-type) is approximately normal to the (001) plane. Low-angle tilt N-type boundaries are composed of arrays of dislocations. However, for a small c-axis misorientation, the regions between the dislocation cores are still well connected, providing “pathways” for supercurrents crossing the boundary plane. The P-type boundaries exhibit compositionally and structurally modulated faceting. Although we see local regions of the low Tc (2201) phase at low-angle tilt (<10°) P-type boundaries, there are also “pathways” crossing the boundary plane made up of the high Tc (2212) and (2223) phases. The characteristics of such low-angle tilt grain boundary structures can therefore be modeled to provide general insight into the correlation between high critical current densities and low-texture breadths. On the other hand, a weak link could be formed at high-angle (> 10°) boundaries where there are the low Tc (2201) or insulating phases.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 11 , November 1997 , pp. 3009 - 3028
Copyright
Copyright © Materials Research Society 1997

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