Method of preparing superconducting orthorhomibic-type compounds in bulk using C sub 1 -C sub 6 alkanoic acid salts
This patent describes a process of making substantially orthorhombic superconducting composition of the formula A{sub {ital n}}Q{sub {ital m}}Cu{sub 3}O{sub {ital y}} wherein A is a cuprate superconducting facilitating rare earth element, Q is a cuprate superconducting facilitating alkaline earth element, m is 1 or 2, n is 1 or 2 and y is 3n + 2m + 4/2. It comprises: mixing together at least two of a salt of A, Q and Cu selected from the group consisting of a carbonate, nitrate and mixtures thereof to form a mixed salt of at least two of A, Q and Cu; treating the mixed salt with a strong alkali metal base to precipitate and recover a mixed product of at least two of A, Q and Cu; wet mixing the mixed product of at lest two of A, Q and Cu with a lower alkyl carboxylic acid containing 1--6 carbon atoms in the carboxylic acid to form together the respective organic acid salts; as needed, adding and wet mixing the stoichiometric quantity of the necessary acid salt selected from the group consisting of a carbonate, nitrate and mixtures thereof or oxide of A, Q or Cu to a form mixed compound of A, Q, and Cu; recovering and air drying the mixture compound; and heating the wet mixed compounds from ambient temperature at a ratio of about 20{degrees}C or less per minute to a preselected temperature in the range from about 500{degrees}C to about 950{degrees}C; and holding the preselected temperature for at least 30 minutes and recovering the substantially orthorhombic superconducting composition.
- Assignee:
- Secretary of the Navy, Washington, DC
- Patent Number(s):
- US 4900715; A
- Application Number:
- PPN: US 7-161936A
- OSTI ID:
- 7173188
- Resource Relation:
- Patent File Date: 29 Feb 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CUPRATES
CHEMICAL PREPARATION
RARE EARTH COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CARBONATES
NITRATES
ORTHORHOMBIC LATTICES
SUPERCONDUCTORS
CARBON COMPOUNDS
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication