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Effect of CO2 on the processing of Y–Ba–Cu–O superconductors

Published online by Cambridge University Press:  31 January 2011

G. Selvaduray ,
C. Zhang ,
U. Balachandran ,
Y. Gao ,
K.L. Merkle ,
H. Shi  and
R.B. Poeppel
G. Selvaduray
Affiliation:
Department of Materials Engineering, San Jose State University, San Jose, California 95192-0086
C. Zhang
Affiliation:
Department of Materials Engineering, San Jose State University, San Jose, California 95192-0086
U. Balachandran
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4838
Y. Gao
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4838
K.L. Merkle
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4838
H. Shi
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4838
R.B. Poeppel
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4838
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Abstract

The superconducting properties of YBa2Cu3O6+x reacted with various known ratios of O2/CO2 gas mixtures during sintering at different temperatures were studied. Jc was found to decrease drastically upon reaction with CO2, becoming zero at certain CO2 activities. The stability region for the 123 superconductor, as a function of CO2 activity and temperature, was empirically formulated as follows: log pCO2 < (−45,000)/T + 33.4. The grain boundaries in sintered samples with Jc = 0 were investigated with HRTEM in conjunction with EDS. Two distinct types of grain boundaries were observed. Approximately 10% of the grain boundaries were wet by a thin layer of a second phase, deduced to be BaCuO2. The remaining boundaries were sharp grain boundaries. The grain structure near the sharp grain boundaries was tetragonal. These two types of grain boundaries are thought to be responsible for Jc being zero.

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Type
Articles
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Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 283 - 291
Copyright
Copyright © Materials Research Society 1992

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