Process for making 90 K superconductors
This patent describes an improved process for preparing a superconducting composition having the formula MBa{sub 2}Cu{sub 3}O{sub x} wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; x is from about 6.5 to 7.0; the composition having a superconducting transition temperature of about 90K; the process consisting essentially of mixing M{sub 2}O{sub 3}, BaO{sub 2} and CuO in an atomic ratio of M:Ba:Cu of about 1:2:3 to obtain a powder mixture; heating the resulting mixture in an oxygen-containing atmosphere at a temperature from about 850{degrees} C. to about 925{degrees} C. for a time sufficient to form MBa{sub 2}Cu{sub 3}O{sub y}, where y is from about 6.0 to about 6.4; and maintaining the MBa{sub 2}Cu{sub 3}O{sub y} in an oxygen-containing atmosphere while cooling for a time sufficient to obtain the desired product, the process not requiring additional heating steps.
- Assignee:
- E.I. DuPont de Nemours and Co., Wilmington, DE (USA)
- Patent Number(s):
- US 5036043; A
- Application Number:
- PPN: US 7-529752
- OSTI ID:
- 5730982
- Country of Publication:
- United States
- Language:
- English
Similar Records
Process for making 90 K superconductors using a spray dried oxalate precursor
Process for making 90 degree K. superconductors by impregnating cellulosic article with precursor solution
Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COPPER COMPOUNDS
COPPER OXIDES
DYSPROSIUM
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ERBIUM
EUROPIUM COMPOUNDS
FABRICATION
GADOLINIUM
HOLMIUM
LUTETIUM
METALS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RARE EARTH COMPOUNDS
RARE EARTHS
SAMARIUM COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
THULIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTERBIUM
YTTRIUM COMPOUNDS