Passivation of high T/sub c/ superconductor surfaces with CaF/sub 2/ and Bi, Al, and Si oxides
X-ray photoelectron spectroscopy has been used to investigate passivation of the high-temperature superconductors YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/O/sub 8+//sub y/ involving overlayer materials deposited in vacuum onto freshly cleaved surfaces. CaF/sub 2/ was found to be completely inert and to form uniform overlayers on the surface. Deposition of Bi, Si, and Al in activated oxygen produced oxides and exhibited minimal reaction and disruption of the superconductor surface. In contrast, results for Bi, Si, and Al deposition in nonactivated oxygen or ultrahigh vacuum showed extensive substrate disruption due to surface reactions and oxygen withdrawal. This indicates that the activation technique provides oxygen from the gas phase for oxide formation and facilitates nondisruptive overlayer growth, even for reactive metals.
- Research Organization:
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
- OSTI ID:
- 6845381
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 53:17
- Country of Publication:
- United States
- Language:
- English
Similar Records
Real-time scanning tunneling microscopy observations of the oxidation of a Ti/Pt(111)-(2x2) surface alloy using O{sub 2} and NO{sub 2}
Cluster-assembled overlayers and high-temperature superconductors
Related Subjects
BARIUM OXIDES
PASSIVATION
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
ALUMINIUM
BISMUTH
CALCIUM FLUORIDES
EXPERIMENTAL DATA
FILMS
SILICON
SUPERCONDUCTING FILMS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHALCOGENIDES
COPPER COMPOUNDS
DATA
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SEMIMETALS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360205 - Ceramics
Cermets
& Refractories- Corrosion & Erosion