Surface degradation of YBa2Cu3O7−δ superconductors on exposure to air and humidity
Temel H. Büyüklimanli, Joseph H. Simmons
DOI 10.1103/PhysRevB.44.727 · Physical Review B
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Abstract
Surface modifications from exposure of YBa2Cu3O7−δ pellets and thin films of the 1:2:3 composition to ambient atmosphere and 85% relative humidity at 50 °C were measured using x-ray photoelectron spectroscopy and scanning Auger electron multiprobe. Surface formation of BaCO3 and Ba(OH)2 was detected. The surface layer of the sintered pellets did not have any Cu after 48 h of moisture treatment. The degradation in the thin-film samples was substantially less. The rate of degradation appears to be controlled by grain-boundary diffusion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | midpoint |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | midpoint |
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