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Spatial variations in a.c. susceptibility and microstructure for the YBa2Cu3O7−x superconductor and their correlation with room-temperature ultrasonic measurements

Published online by Cambridge University Press:  31 January 2011

Don J. Roth ,
Mark R. DeGuire ,
Leonard E. Dolhert  and
Aloysius F. Hepp
Don J. Roth
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
Mark R. DeGuire
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
Leonard E. Dolhert
Affiliation:
W. R. Grace & Co., Research Division, Columbia, Maryland 21044
Aloysius F. Hepp
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135
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Abstract

The purpose of this study was to (1) examine the spatial (within-sample) uniformity of superconducting behavior and microstructure in YBa2Cu3O7−x specimens over the pore fraction range 0.10–0.25 and (2) determine the viability of using a room-temperature, nondestructive characterization method (ultrasonic velocity imaging) to predict spatial variability. Spatial variations in a.c. susceptibility were observed for specimens containing 0.10 pore fraction. An ultrasonic velocity image constructed from measurements at 1 mm increments across one such specimen revealed microstructural variation between edge and center locations that correlated with variations in a.c. shielding and loss behavior. Optical quantitative image analysis on sample cross sections revealed pore fraction to be the varying microstructural feature.

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Articles
Information
Journal of Materials Research , Volume 6 , Issue 10 , October 1991 , pp. 2041 - 2053
Copyright
Copyright © Materials Research Society 1991

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