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):
- US 4994420; A
- Application Number:
- PPN: US 7-420172
- OSTI ID:
- 5554926
- Resource Relation:
- Patent File Date: 12 Oct 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERAMICS
CHEMICAL COMPOSITION
SUPERCONDUCTORS
BARIUM OXIDES
COPPER OXIDES
RARE EARTH COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication