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Reoxygenation of vacuum-annealed YBa2Cu3O6.9

Published online by Cambridge University Press:  31 January 2011

D. S. Ginley ,
P. J. Nigrey ,
E. L. Venturini ,
B. Morosin  and
J. F. Kwak
D. S. Ginley
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
P. J. Nigrey
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
E. L. Venturini
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
B. Morosin
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
J. F. Kwak
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

Vacuum-annealed samples of single-phase orthorhombic YBa2Cu3O6.9 have been reoxygenated. The vacuum-annealed material is tetragonal, semiconducting at room temperature, and shows no superconductivity. Upon annealing these samples in 640 Torr O2 at 200°C, a partial return of 90 K superconductivity is observed; complete restoration is achieved following 300°C anneals. Oxygen uptake in vacuum-annealed pellets follows an Arrhenius relation with an activation energy of −27 kcal/mol. Deoxygenation and reoxygenation does not seem to affect the structure of the grain interconnects in the material. The maximum oxygen uptake for vacuum-annealed material occurs at 450°C, while the maximum magnetic Meissner effect is observed following oxygen annealing at 350°C.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 732 - 735
Copyright
Copyright © Materials Research Society 1987

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References

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