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Effect of heat treatment time and temperature on the properties of YBa2Cu3O7−x

Published online by Cambridge University Press:  31 January 2011

Ira Bloom ,
B. S. Tani ,
M. C. Hash ,
Donglu Shi ,
M. A. Patel ,
K. C. Goretta ,
Nan Chen  and
D. W. Capone II
Ira Bloom
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
B. S. Tani
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
M. C. Hash
Affiliation:
Chemical Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
Donglu Shi
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
M. A. Patel
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
K. C. Goretta
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
Nan Chen
Affiliation:
Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439–4837
D. W. Capone II
Affiliation:
Supercon, Inc., Shrewsbury, Massachusetts 01514
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Abstract

Two YBa2Cu3O7−x powders were investigated: one was nearly stoichiometric, and the other, CuO-rich. After being sintered at 950 °C, samples from both powders were heat-treated in oxygen at 845, 860, and 910 °C for up to 10 days. The samples were characterized by differential thermal analysis, x-ray diffraction, optical and scanning electron microscopy, iodometric titrations, and measurement of their superconducting properties (electrical resistivity, critical temperature, and critical current density). The electrical properties of the nearly stoichiometric material improved with time at all temperatures. On the other hand, the electrical properties of the CuO-rich material deteriorated with temperature, possibly owing to problems associated with grain growth at 910 °C.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1093 - 1098
Copyright
Copyright © Materials Research Society 1989

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References

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