Metalorganic deposition method for forming epitaxial thallium-based copper oxide superconducting films
This patent describes a method for producing a superconducting article comprising an oriented metal oxide superconducting layer containing thallium, optionally calcium, barium and copper, the layer being at least 30 {Angstrom} and having a c-axis oriented normal to a crystalline substrate surface. It comprises coating the crystalline substrate surface with a solution of thallium, optionally calcium, barium and copper carboxylate soaps dispersed in a medium of hydrocarbons of halohydrocarbons with a stoichiometric metal ratio to form the oxide superconducting layer, prepyrolyzing the soaps coated on the substrate at a temperature of 350{degrees} C. or less in an oxygen containing atmosphere, and pyrolyzing the soaps at a temperature in the range of 800{degrees} - 900{degrees} C. in the presence of oxygen and an overpressure of thallium for a sufficient time to produce the superconducting layer on the substrate, wherein usable portions of the superconducting layer are epitaxial to the substrate.
- Assignee:
- Superconductor Technologies, Inc., Santa Barbara, CA (United States)
- Patent Number(s):
- US 5071830; A
- Application Number:
- PPN: US 7-238919
- OSTI ID:
- 5701938
- Resource Relation:
- Patent File Date: 31 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER OXIDES
EPITAXY
SUPERCONDUCTING FILMS
THALLIUM
BARIUM
CALCIUM
CARBOXYLATION
DEPOSITION
DISPERSIONS
HYDROCARBONS
METALS
ORIENTATION
OXYGEN
PYROLYSIS
STOICHIOMETRY
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
ALKALINE EARTH METALS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
DECOMPOSITION
ELEMENTS
FILMS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry