Wet chemical techniques for passivation of YBa sub 2 Cu sub 3 O sub 7 minus x

Journal Article · Mon Oct 23 04:00:00 EDT 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102323· OSTI ID:5373202

Vasquez, R P; Foote, M C; Hunt, B D ^[1]

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1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (US)

Wet chemical techniques are described for treatment of YBa{sub 2}Cu{sub 3}O{sub 7}{sub {minus}{ital x}} surfaces, resulting in the formation of native compounds with little or no reactivity to water. Promising native compounds include CuI, BaSO{sub 4}, CuS, Cu{sub 2}S, and the oxalates, all of which are either insoluble or have very low solubility in water. Treatment with dilute HI results in the formation of anative iodide film which is 80--90% CuI with small amounts of YI{sub 3} and BaI{sub 2}. Treatment with dilute H{sub 2}SO{sub 4} results in the formation of a film which is 95% BaSO{sub 4} and 5% Y{sub 2}(SO{sub 4}){sub 3}. Cu{sub 2}S is formed on the surface with a dilute Na{sub 2}S solution. An oxalate film with equal amounts of Y{sub 2}(C{sub 2}O{sub 4}){sub 3} and BaC{sub 2}O{sub 4} results from treatment with dilute oxalic acid. X-ray photoelectron spectra show no significant changes when the sulfide, sulfate, or oxalate films are dipped in water, while the iodide film shows evidence of Cu(OH){sub 2} formation.

• OSTI ID: 5373202
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:17; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CARBOXYLIC ACID SALTS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER HYDROXIDES
COPPER OXIDES
DATA
ELECTRON SPECTROSCOPY
EXPERIMENTAL DATA
FABRICATION
FILMS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INORGANIC ACIDS
NUMERICAL DATA
OXALATES
OXIDES
OXYGEN COMPOUNDS
PASSIVATION
PEROVSKITES
PHOTOELECTRON SPECTROSCOPY
SODIUM COMPOUNDS
SODIUM SULFIDES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SULFURIC ACID
SUPERCONDUCTING FILMS
SURFACE TREATMENTS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES