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Microstructure and properties of Cu-rich 123. Part I: Copper at the grain boundaries

Published online by Cambridge University Press:  31 January 2011

J.P. Zhang ,
D.J. Li ,
L.D. Marks ,
C.H. Lin ,
J.A. Eades ,
A. Sodonis ,
W. Wolbach ,
J.M. Chabala  and
R. Levi-Setti
J.P. Zhang
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
D.J. Li
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
L.D. Marks
Affiliation:
Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
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

A range of copper-rich bulk YBa2Cu3+xO7+y superconductors have been prepared by mixing excess copper oxide in the initial material and characterized for their magnetic properties and microstructure. The microstructure of the materials exhibits a high density of planar defects at the grain boundaries and a grain boundary amorphous phase. There is a small increase in the magnetic Jc at 4.5 K but a decrease compared to a conventional material at 77 K, and there is no correlation of the magnetic Jc with the twin boundary density. The change in Jc can be understood if the grain boundary pinning is strong at 4.5 K but weak at 77 K. Data obtained using a very wide range of different microstructure characterization techniques clearly indicate the dangers of relying on only one technique to obtain a full picture of the material.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 3 , March 1992 , pp. 572 - 579
Copyright
Copyright © Materials Research Society 1992

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