Method for preparing rare earth-barium-cuprate pre-ceramic resins and superconductive materials prepared therefrom
This patent describes a method of making a pre-ceramic material capable of being converted into an electrically superconductive ceramic material having the general formula ABa{sub 2}CU{sub 3}O{sub 7{minus}x} where A is a rare earth metal and x is from 0 to 0.5. It comprises: refluxing stoichiometric amounts of a first solution comprising a rare earth isopropoxide and barium isopropoxide in isopropanol under a dry, inert atmosphere; adding to the first solution a stoichiometric amount of a second solution comprising copper ethylhexanoate in isopropanol; refluxing the first and second solutions to obtain a precipitate; adding to the precipitate a quantity of a first solvent comprising water and isopropanol having from about 2 to 10 equivalents of water per mole of rare earth isopropoxide to hydrolyze the precipitate and to sufficiently dissolve the precipitate to produce a substantially homogeneous solution; concentrating the homogeneous solution by removing a sufficient amount of the first solvent to produce a viscous or dry pre-ceramic resinous material; softening or dissolving the pre-ceramic resinous material in a second solvent comprising a nonpolar solvent or alcohol and a nonpolar solvent to obtain a desired viscosity; and forming the viscous pre-ceramic material into the desired product shape.
- Assignee:
- General Atomics, San Diego, CA (United States)
- Patent Number(s):
- US 5100871; A
- Application Number:
- PPN: US 7-441955
- OSTI ID:
- 5077983
- Resource Relation:
- Patent File Date: 28 Nov 1989
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CUPRATES
SUPERCONDUCTIVITY
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
CHEMICAL PREPARATION
BARIUM COMPOUNDS
CHEMICAL COMPOSITION
MATERIALS TESTING
RESINS
SOLID SOLUTIONS
STOICHIOMETRY
ALKALINE EARTH METAL COMPOUNDS
COPPER COMPOUNDS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MIXTURES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
POLYMERS
SOLUTIONS
SYNTHESIS
TESTING
TRANSITION ELEMENT COMPOUNDS
665412* - Superconducting Devices- (1992-)
665411 - Basic Superconductivity Studies- (1992-)
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies