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Electron microscopy of a Gd–Ba–Cu–O superconductor

Published online by Cambridge University Press:  31 January 2011

R. Ramesh ,
G. Thomas ,
R. L. Meng ,
P. H. Hor  and
C. W. Chu
R. Ramesh
Affiliation:
Department of Materials Science and Mineral Engineering and National Center for Electron Microscopy, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
G. Thomas
Affiliation:
Department of Materials Science and Mineral Engineering and National Center for Electron Microscopy, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
R. L. Meng
Affiliation:
Department of Physics and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77004
P. H. Hor
Affiliation:
Department of Physics and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77004
C. W. Chu
Affiliation:
Department of Physics and Space Vacuum Epitaxy Center, University of Houston, Houston, Texas 77004
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Abstract

An electron microscopy study has been carried out to characterize the microstructure of a sintered Gd–Ba–Cu–O superconductor alloy. The GdBa2Cu3O7−x phase in the oxygen annealed sample is orthorhombic while in the vacuum annealed sample it is tetragonal. It is shown that the details of the fine structure in the [001] zone axis convergent beam patterns can be used to distinguish between the orthorhombic form and the tetragonal form. In addition to this matrix phase, an amorphous phase is frequently observed at the triple grain junctions. Gd-rich inclusions have been observed inside the matrix phase.

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Articles
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Journal of Materials Research , Volume 4 , Issue 3 , June 1989 , pp. 515 - 520
Copyright
Copyright © Materials Research Society 1989

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