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Microstructure and properties of Cu-rich 123: Part II. Homogeneous copper and high magnetic Jc

Published online by Cambridge University Press:  31 January 2011

J.P. Zhang ,
D.J. Li ,
C. Boldt ,
R. Plass ,
V. Dravid ,
L.D. Marks ,
C.H. Lin ,
J.A. Eades ,
A. Sodonis  and
W. Wolbach
...Show all authors
J.P. Zhang
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
D.J. Li
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
C. Boldt
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
R. Plass
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
V. Dravid
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
L.D. Marks
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208-3108
C.H. Lin
Affiliation:
Science and Technology Center for Superconductivity, Materials Research Laboratory, University of Illinois at Champaign–Urbana, 104 South Goodwin, Urbana, Illinois 61801
J.A. Eades
Affiliation:
Science and Technology Center for Superconductivity, Materials Research Laboratory, University of Illinois at Champaign–Urbana, 104 South Goodwin, Urbana, Illinois 61801
A. Sodonis
Affiliation:
Science and Technology Center for Superconductivity, The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637
W. Wolbach
Affiliation:
Science and Technology Center for Superconductivity, The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637
J.M. Chabala
Affiliation:
Science and Technology Center for Superconductivity, The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637
R. Levi-Setti
Affiliation:
Science and Technology Center for Superconductivity, The Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637
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Abstract

Copper- and yttrium-rich YBa2Cu3O7 bulk superconductors have been prepared by mixing copper oxide or yttrium oxide in nitric acid and adding the solution to premade stoichiometric YBa2Cu3O7 followed by annealing. In contrast to materials made by mixing oxide powders, both samples contain copper-rich defects spread homogeneously throughout the grains, either small platelet copper oxide precipitates or bundles of planar defects (Cu–O double planes). These materials also show large magnetic hysteresis at 77 K, comparable to the results obtained from decomposed YBa2Cu4O8. This implies that small copper oxide precipitates and bundles of planar defects are strong flux pinners, and indicates a processing route to producing large amounts of strongly intragranular pinned superconductors. However, the materials also show clean grain boundaries, so an equally valid interpretation is that there is a substantial component of intergranular superconductivity in field, enhancing the effective circuit size to a value far larger than the grain size.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 6 , June 1993 , pp. 1232 - 1239
Copyright
Copyright © Materials Research Society 1993

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References

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