Process for making superconductors using barium hydroxide

Patent · Tue Oct 29 00:00:00 EST 1991

OSTI ID:5353559

Horowitz, H S

This patent describes a process for preparing a superconducting composition of the formula M{sub 1}Ba{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, and x is a numerical value in the range of about 6.5 to 7.0. It comprises forming a suspension by mixing barium hydroxide and M{sub 2}O{sub 3} with an aqueous solution of a cupric carboxylate or cupric nitrate at a temperature from about 50{degrees} C to about 100{degrees} C or mixing barium hydroxide with an aqueous solution of a cupric carboxylate or cupric nitrate and an M-carboxylate or M-nitrate at a temperature from about 50{degrees} C to about 100{degrees} C to obtain a suspension having M:Ba:Cu present in an atomic ratio of about 1:2:3; drying the suspension formed in step (a) to obtain a precursor; and heating the precursor in an oxygen-containing atmosphere at a temperature of about 850{degrees} C to about 950{degrees} C for a time sufficient to from M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} where y is from about 6.0 to about 6.4 and maintaining the M{sub 1}Ba{sub 2}Cu{sub 3}O{sub y} in an oxygen-containing atmosphere while cooling for a time sufficient to obtain M{sub 1}Ba{sub 2}Cu{sub 3}O{sub x}.

• Assignee: E.I. Du Pont de Nemours and Co., Wilmington, DE (United States)
• Patent Number(s): US 5061683; A
• Application Number: PPN: US 7-197961
• OSTI ID: 5353559
• Resource Relation: Patent File Date: 31 May 1988
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
COPPER OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
CHEMICAL COMPOSITION
AQUEOUS SOLUTIONS
BARIUM HYDROXIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
EUROPIUM
GADOLINIUM
HOLMIUM
NEODYMIUM
PRECURSOR
SAMARIUM
YTTERBIUM
YTTRIUM
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTHS
REACTION KINETICS
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
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Cermets
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