Y-Ba-Cu-O superconductive substance

Details Y-Ba-Cu-O superconductive substance Y-Ba-Cu-O superconductive substance

1991-11-26

1993-08-24

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 505780, C01F 1102, C01F 1700, C01G 302, H01L 3912

Patent

active

052389120

ABSTRACT:
The disclosed substance has a composition of Y.sub.x Ba.sub.y CuO.sub.z, wherein x=0.2-0.5 y=0.2-0.5 and z.perspectiveto.l+y+(3/2)x, with a face-centered tetragonal crystalline structure of perovskite type. When being cooled at 85-135K, the structure of the substance starts to transform and its electric resistance disappears at a temperature higher than 47K so that the substance becomes superconductive.

REFERENCES:
Physical Review Letters, vol. 58, No. 9, Mar. 2, 1987, pp. 908-910.
Pramana Journal of Physics, vol. 28, No. 3, Mar., 1987, pp. L321-L323.
Journal of Solid State Chemistry, vol. 37, 1981, pp. 151-156.
Synthetic Metals, vol. 4, 1981, pp. 157-167.
Z. Phys. B--Condensed Matter, vol. 64, 1986, pp. 189-193.
J. Z. Sun et al, "Superconductivity and Magnetism in the High-T.sub.c Superconductor Y-Ba-Cu-O", Physical Review Letters, vol. 58, No. 15, Apr. 13, 1987.
Japanese Journal of Applied Physics, vol. 26, No. 4, Apr., 1987, pp. L429-L431, L454-L455, L456-L457, L498-L501, L476-L478, L502-L503.
Solid State Communications, vol. 66, No. 2, 1988, pp. 177-180.
Qadri et al, "X-Ray Identification of the Superconducting High T.sub.c Phase in the Y-Ba-Cu-O System", preprint from the Naval Research Laboratory, available Mar. 6, 1987.

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