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An optimum heating program for fabricating MTG Bi1.6Pb0.4Sr2Ca2Cu3Oy superconductors

Published online by Cambridge University Press:  03 March 2011

Z.L. Du ,
T.F. Yu ,
J.C.L. Chow  and
P.C.W. Fung
Z.L. Du
Affiliation:
Physics Department, The University of Zhongshan, Guangzhou, China
T.F. Yu
Affiliation:
Physics Department, The University of Hong Kong, Hong Kong
J.C.L. Chow
Affiliation:
Physics Department, The University of Hong Kong, Hong Kong
P.C.W. Fung
Affiliation:
Physics Department, The University of Hong Kong, Hong Kong
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Abstract

Following our recent report on the successful fabrication of “stationary” MTG Bi1.6Pb0.4Sr2Ca2Cu3Oy pellets in a simple tube furnace, we have tried many heating programs with various “crystal growth starting temperatures”, Ts, and sintering temperatures, Te; the samples are sintered for 20–40 h before quenching in air. It is found that Ts-Te should be rather narrow to produce good MTG samples, and the typical value of Jc is enhanced from 100 A cm−2 (for a polycrystalline sample) to about 3 × 103 A cm−2 for our good ones. SEM and TEM results indicate that the samples are full of packs which contain highly oriented mica-like layers.

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Articles
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Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2231 - 2237
Copyright
Copyright © Materials Research Society 1994

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References

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