Rapid thermal processing of YBa sub 2 Cu sub 3 O sub 7 spun wires

Journal Article · Tue May 15 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345160· OSTI ID:6815746

Ginley, D S; Venturini, E L; Kwak, J F; Mitchell, M A; Morosin, B; Baughman, R J ^[1]; Halloran, J W; Neal, M J ^[2]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185-5800 (USA)
2. CPS Superconductor, Milford, Massachusetts 01757 (USA)

Rapid thermal processing has been utilized to sinter and anneal phase-pure and CuO-rich YBa{sub 2}Cu{sub 3}O{sub 7} fibers and woven fibers formed by melt spinning a powder/polymer composite. The optimum temperature for sintering the powders varies for the stoichiometric (1025 {degree}C) and 5% CuO-rich fibers (1000 {degree}C), but in both cases the temperature window is extremely narrow ({plus minus}25 {degree}C). Typical processing consists of a rapid heating (250 {degree}C/s) of the fibers to the sintering temperature in 1 atm of pure oxygen, holding at temperature for 1 s and cooling over a period of 2--3 min. The resulting fibers are orthorhombic YBa{sub 2}Cu{sub 3}O{sub 7} with large Meissner and shielding fractions, have zero resistance up to 92 K, critical-current densities in zero applied field to 1100 A/cm{sup 2} at 76 K, and show clean grain boundaries by transmission electron microscopy. Despite the short processing times, microstructural analysis shows considerable grain growth and evidence of metastable congruent melting of oxygen-rich YBa{sub 2}Cu{sub 3}O{sub 7}.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6815746
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
FABRICATION
GRAIN BOUNDARIES
HEAT TREATMENTS
MATERIALS
MICROSCOPY
MICROSTRUCTURE
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
POWDERS
SINTERING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY
WIRES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES