Development of a scalable Tl-1223 tape process -- thallination of powder precursor coatings

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:483598

Tkaczyk, J E; Lay, K W ^[1]; Schulz, D ^[2]

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1. GE Corporate Research & Development, Schenectady, NY (United States)
2. National Renewable Energy Lab., Golden, CO (United States); and others

Superconducting tapes, 10-20 cm long, of TlBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 9} on Ag have been fabricated by deposition of a thallium-free powder precursor on Ag followed by reaction with a thallium oxide vapor species. Single-sided and two-sided coatings are prepared using a spray-deposition or dip-coating, respectively. The coated tapes are annealed and then mechanically processed to densify the precursor. Continuous thallination of precursor tapes is performed by pulling the coated tape through a two-zone furnace at constant velocity and gave similar results as batch processing. Critical currents of the order 10-20 A at 77K, zero field for a 5 mm wide tape are observed. Properties as a function of magnetic field indicate reduced flux creep compared to the more anisotropic bismuth cuprate superconductors and make thallium 1223 an attractive material for conductor applications at high temperatures.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 483598
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42B; ISSN 0065-2482; ISSN ACYEAC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
COATINGS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
POWDERS
PRECURSOR
SILVER
SUPERCONDUCTING WIRES
SYNTHESIS
THALLIUM OXIDES