Fabrication of oxide superconductors by melt growth method

Patent · Tue Apr 30 00:00:00 EDT 1991

OSTI ID:5097728

Jin, S; Sherwood, R C; Tiefel, T H

This paper describes a method of fabricating a body that comprises a superconductive oxide of nominal composition Ba{sub 2{minus}z}M{sub 1{minus}y}X{sub x + y}Cu{sub 3}O{sub 7+{delta}} where M is selected from the group consisting of Y Eu, La, and combinations thereof, the optional X is different from Ba and M and is selected from the group consisting of the elements of atomic number 57-71, Sc, Ca and Sr, with 0 {le} x + y {le} 1 and 0 {le} {delta} {le} 0.5, and with Ba and M being at least 50% unsubstituted. It comprises: providing a quantity of precursor material comprising an oxide of one or more of Ba, Cu, M and X, associated with the precursor material is a phase diagram comprising a solid-liquid region and a liquid regions, and a solidus temperature; heating the precursor material such that at least a portion thereof is at a temperature above the solidus temperature and is a liquid; cooling at least a part of the liquid precursor material to a temperature below the solidus temperature such that re-solidified precursor material results, the rate of cooling selected such that at least a substantial portion of the re-solidified precursor material comprise elongate grains, associated with a given elongate grain being a long axis and an aspect ratio, at least a substantial fraction of the elongate grains measuring at least about 10 {mu}m along the long axis and having an aspect ratio of at least 10:1: and heat treating the re-solidified precursor material in an oxygen-containing atmosphere such that the superconductive oxide is produced from the re-solidified precursor material.

• Assignee: AT and T Bell Lab., Murray Hill, NJ (USA)
• Patent Number(s): US 5011823; A
• Application Number: PPN: US 7-126083; TRN: 91-031571
• OSTI ID: 5097728
• Resource Relation: Patent File Date: 27 Nov 1987
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SUPERCONDUCTORS
FABRICATION
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
EUROPIUM OXIDES
LANTHANUM OXIDES
SCANDIUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
EUROPIUM COMPOUNDS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCANDIUM COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360204 - Ceramics
Cermets
& Refractories- Physical Properties