Production of oxide superconductors having large magnetic levita

Details Production of oxide superconductors having large magnetic levita Production of oxide superconductors having large magnetic levita

1993-03-29

1995-12-12

Fiorilla, Christopher A.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With melting

264 82, 264122, 264125, H01L 3912

Patent

active

054749760

ABSTRACT:
A method for producing an REBaCuO oxide superconductor having large magnetic levitation force, where RE is a rare earth element selected from the group consisting of Y, Sm, Eu, Gd, Dy, Ho, Er, and Yb, involves the steps of using a raw material mixture as the starting feed, heating the raw material mixture for partial melting, followed by cooling and solidification, pulverizing and mixing the resulting solid, shaping the resulting mixture into a given shape, placing or embedding nucleates on or in the resulting shape, followed by heating for partial melting, and cooling the resulting partial melt to a substantial temperature at which a superconducting phase starts to form, followed by slow cooling, whereby the superconducting phase is preferentially formed and grown from a nucleation site.

REFERENCES:
patent: 4892861 (1990-01-01), Ray
patent: 4990493 (1991-02-01), Lay
patent: 5017548 (1991-05-01), Hirakawa et al.
patent: 5057487 (1991-10-01), Parker et al.
JP Abstract 89-244553/34, Derwent Publications, 1989.
"Superconductivity of YBa.sub.2 Cu.sub.3 O.sub.7-x by Addition of Reactive Fine Powders", Sakai et al., Japanese Journal of Applied Physics, vol. 30, No. 2, pp. 246-250, Feb. 1991.
"Effects of the Platinum Group Element Addition on Preparation of YBCO Superconductor by Melt Growth Method", Yoshida et al., Physica c Superconductivity, vol. 185-189 Part IV, Dec. 1, 1991.

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