Reduced reactivity to air on HF-treated YBa2Cu3O7−x surfaces
- 5 June 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (23) , 2373-2375
- https://doi.org/10.1063/1.101532
Abstract
Treatment of YBa2Cu3O7−x films with a nonaqueous solution of HF in absolute ethanol results in the formation of an oxyfluoride with relative Y:Ba:Cu concentrations of 1:4:3 on the surface, as determined by x‐ray photoelectron spectroscopy. The passivation properties of chemically treated films were tested by monitoring the growth of the high binding energy O 1s peak, associated with nonsuperconducting surface species, as a function of air exposure time, for both HF‐treated and untreated films. The native oxyfluoride is shown to reduce the reactivity of the superconductor to air.Keywords
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