Reoxygenation of vacuum-annealed YBa2Cu3O6.9
- 1 December 1987
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 2 (6) , 732-735
- https://doi.org/10.1557/jmr.1987.0732
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.Keywords
This publication has 6 references indexed in Scilit:
- Superconductivity and magnetism in the high-superconductor YBaCuOPhysical Review Letters, 1987
- High superconducting transition temperatures in sputter-deposited YBaCuO thin filmsNature, 1987
- High-Tc Superconductivity and Diamagnetism of Y-Ba-Cu OxidesJapanese Journal of Applied Physics, 1987
- Superconductivity at 40 K in the Oxygen-Defect Perovskites La
2-
x
Sr
x
CuO
4-
y
Science, 1987
- Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressurePhysical Review Letters, 1987
- Bulk superconductivity at 36 K inPhysical Review Letters, 1987