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Grain growth and the microstructural effects on the properties of YBa2Cu3O7−y superconductor

Published online by Cambridge University Press:  31 January 2011

C. T. Chu  and
B. Dunn
C. T. Chu
Affiliation:
Department of Materials Science and Engineering, Solid State Science Center, University of California-Los Angeles, Los Angeles, California 90024
B. Dunn
Affiliation:
Department of Materials Science and Engineering, Solid State Science Center, University of California-Los Angeles, Los Angeles, California 90024
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Abstract

The microstructural development and grain growth of YBa2Cu3O7−y ceramics at 925, 950, and 975 °C were studied. Densification occurred quite rapidly at temperatures below 925 °C. The grain growth of YBa2Cu3O7−y followed a D5 − D50 = Kt relation when sintered at 925 and 950 °C. At 975 °C, the kinetics changed to cubic (D3) behavior, which can be attributed to the formation of a liquid phase at grain boundaries. A trend of decreasing Jc with increasing sintering temperature was observed. Other properties including Tc and the width of the transition were virtually unaffected by the change in microstructure. Without prolonged annealing, a relatively homogeneous oxygen stoichiometry of 6.8 was obtained for fairly dense samples (>93% of theoretical). These results suggest that the oxygenation rate of YBa2Cu3O7−y was quite rapid between the tetragonal phase and the orthorhombic composition of YBa2Cu3O6.8.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 9 , September 1990 , pp. 1819 - 1826
Copyright
Copyright © Materials Research Society 1990

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