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Electromagnetic and microstructural investigations of a naturally grown 8° [001] tilt bicrystal of Bi2Sr2CaCu208 + x

Published online by Cambridge University Press:  31 January 2011

Jyh-Lih Wang ,
I-Fei Tsu ,
X. Y. Cai ,
R. J. Kelley ,
M. D. Vaudin ,
S. E. Babcock  and
D. C. Larbalestier
Jyh-Lih Wang
Affiliation:
Applied Superconductivity Center, Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
I-Fei Tsu
Affiliation:
Applied Superconductivity Center, Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
X. Y. Cai
Affiliation:
Applied Superconductivity Center, University of Wisconsin, Madison, Wisconsin 53706
R. J. Kelley
Affiliation:
Applied Superconductivity Center, Department of Physics, University of Wisconsin, Madison. Wisconsin 53706
M. D. Vaudin
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
S. E. Babcock
Affiliation:
Applied Superconductivity Center, Department of Materials Science and Engineering, Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
D. C. Larbalestier
Affiliation:
Applied Superconductivity Center, Department of Materials Science and Engineering, Materials Science Program and Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

Electromagnetic characterization and high resolution transmission electron microscopy have been conducted on the same 8° [001] symmetrical (010) tilt boundary in a naturally grown, bulk-scale bicrystal of Bi2Sr2CaCu2O8 + x (BSCCO-2212). The resistive transition showed excess resistance above and below Tc, suggesting some weak coupling at the boundary, but the inter- and intragranular voltage-current characteristics, irreversibility fields, and critical current density (Jc) values were very similar and characteristic of strongly coupled grains and grain boundary. The misorientation was accommodated by a set of partial dislocations with the Frank spacing of 1.9 nm. The dislocation cores appeared to be separated by relatively undistorted regions of crystal. The Jc, values at 25 K exceeded 103 A/cm2 in fields of several tesla, more than two orders of magnitude larger than that found earlier in [001] twist boundaries of BSCCO-2212. This result is consistent with the view that low angle [001] till boundaries play an important role for current transport in polycrystalline BSCCO tapes.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 4 , April 1996 , pp. 868 - 877
Copyright
Copyright © Materials Research Society 1996

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