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Annealing of pressure-induced structural damage in superconducting Bi–Pb–Sr–Ca–Cu–O ceramic

Published online by Cambridge University Press:  03 March 2011

I. Maartense  and
Asok K. Sarkar
I. Maartense
Affiliation:
Wright Laboratory, Materials Directorate, WL/MLPO, Wright-Patterson Air Force Base, Ohio 45433–6533
Asok K. Sarkar
Affiliation:
University of Dayton Research Institute, Metals & Ceramics Division, Dayton, Ohio 45469–0170
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Abstract

Ac susceptibility measurements have been used to monitor the changes in the superconductive properties of sintered and uniaxially pressed samples of Pb-stabilized 2223-phase bismuth cuprate ceramic as the structural damage was annealed in air in a sequence of steps in temperature between 500 and 850 °C. It is concluded that below 600 °C a relaxation of residual stresses is responsible for a 2% shrinkage in sample volume and a small improvement in bulk superconductive transition temperature, Tc. Above 700 °C, a recovery of the original properties occurs through grain regrowth governed by an activation energy of ∼200 kJ/mol. However, in the region between 600 and 700 °C, a decrease in Tc of ∼40 K appears to be the result of plastic flow and amorphization associated with local decomposition of 2223 which reduces the effective grain size and weakens the intergranular superconductive coupling.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 9 , September 1993 , pp. 2177 - 2186
Copyright
Copyright © Materials Research Society 1993

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References

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