Process for making superconductors using barium nitrate

Patent · Tue Aug 29 00:00:00 EDT 1989

OSTI ID:5299768

McCarron, III, E M

This patent describes an improved process for preparing a superconducting composition having the formula MBa/sub 2/Cu/sub 3/O/sub chi/ wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; chi is from about 6.5 to about 7.0. The process consisting essentially of mixing Ba(NO/sub 3/)/sub 2/, M/sub 2/O/sub 3/ and CuO powders in an atomic ratio of M:Ba:Cu of about 1:2:3 to form a precursor powder and heating the precursor powder in an oxygen-containing atmosphere at a temperature from about 875{sup 0}C to about 950{sup 0}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 being limited to a single heating step without subsequent grinding and reheating.

• Assignee: E.I. DuPont De Nemours and Co., Wilmington, DE
• Patent Number(s): US 4861753
• Application Number: PPN: US 7-064459A; TRN: 90-000770
• OSTI ID: 5299768
• Resource Relation: Patent File Date: 22 Jun 1987
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SUPERCONDUCTORS
SYNTHESIS
BARIUM NITRATES
COPPER OXIDES
DYSPROSIUM
ERBIUM
EUROPIUM
GADOLINIUM
HOLMIUM
LUTETIUM
NEODYMIUM
SAMARIUM
THULIUM
YTTERBIUM
YTTRIUM
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELEMENTS
METALS
NITRATES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTHS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360601* - Other Materials- Preparation & Manufacture