Reoxygenation of vacuum-annealed YBa2Cu3O6.9-Reference-Cited by-同舟云学术

Reoxygenation of vacuum-annealed YBa2Cu3O6.9

Published:1987-12 Issue:6 Volume:2 Page:732-735
ISSN:0884-2914
Container-title:Journal of Materials Research
language:en
Short-container-title:J. Mater. Res.

Author:

Ginley D. S.,Nigrey P. J.,Venturini E. L.,Morosin B.,Kwak J. F.

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.

Publisher

Springer Science and Business Media LLC

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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