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Annealing Effects on Tc in the Tl-Ca-Ba-Cu-O System

Published online by Cambridge University Press:  26 February 2011

M.-J. Tsai ,
S. F. Wu ,
S. W. Lu  and
Y. T. Huang
M.-J. Tsai
Affiliation:
Materials Research Labs., ITRI, Chutung, Hsinchu, Taiwan, 310 ROC.
S. F. Wu
Affiliation:
Materials Research Labs., ITRI, Chutung, Hsinchu, Taiwan, 310 ROC.
S. W. Lu
Affiliation:
Materials Research Labs., ITRI, Chutung, Hsinchu, Taiwan, 310 ROC.
Y. T. Huang
Affiliation:
Materials Research Labs., ITRI, Chutung, Hsinchu, Taiwan, 310 ROC.
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Abstract

Tl-2223 phase with a composition of Tl1.7Ca2.3Ba2Cu3O10 was prepared via a solid-state reaction route and systematically annealed under various conditions, including flowing oxygen, sealed quartz in vacuo, high oxygen pressures and hot isostatic press in an attempt to enhance the superconducting properties in the Tl-Ca-Ba-Cu-0 system. An almost monophasic sample was obtained by sintering at 910 °C for 3 hours in flowing oxygen. Most anneals enhance the Tc by 2 – 7 K, depending on the environment. When the sample is post-annealed at 820 °C for 16 hours in flowing oxygen it results in an optimal Tc of 127 K, as confirmed by magnetic susceptibility and electrical resistance measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 735
Copyright
Copyright © Materials Research Society 1992

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References

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