Method for forming ceramic materials, including superconductors
This patent describes a method for forming high temperature superconductors of the general formula Ln{sub 1}Ba{sub 2}Cu{sub 3}O{sub (7 {minus} {ital d})}, Ln (7 {minus} d), where Ln is selected from the group consisting of yttrium (Y), lanthanum (La), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), and d is less than .5. The method comprises forming a solution by dissolving compatible, pyrolyzable compounds of Ln, Ba and Cu in at least one organic solvent in a molar ratio of approximately 1:2:3, at least one of the pyrolyzable compounds being an iodide salt of one of the metals; evaporating the solvent to form a residue of the pyrolyzable compounds; pyrolyzing the residue in an oxygen containing environment to convert them to oxides.
- Assignee:
- Dow Corning Corp., Midland, MI (USA)
- Patent Number(s):
- A; US 4994420
- Application Number:
- PPN: US 7-420172
- OSTI ID:
- 5554926
- Country of Publication:
- United States
- Language:
- English
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360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL COMPOSITION
COPPER COMPOUNDS
COPPER OXIDES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS