Ceramic high temperature superconductor in bulk form, and method

Details Ceramic high temperature superconductor in bulk form, and method Ceramic high temperature superconductor in bulk form, and method

1989-09-13

1991-07-16

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

501126, 501152, H01B 1200, H01L 3912

Patent

active

050325698

ABSTRACT:
A novel ceramic high temperature superconductor which has at least one phase with the composition (SE)Ba.sub.2 Cu.sub.4-x O.sub.8.+-.y, where SE is a trivalent rare earth atom, x.ltoreq.0.5, and y.ltoreq.1. The novel superconductor is distinguished by high thermal stability. Where the rare earth atom is Y (yttrium), if x=0 and y=0.01 a ceramic is produced which is stable up to about 800.degree. C., and has a transition temperature of 80.degree. K.

REFERENCES:
Morris et al., "Eight New High-Temperature Superconductor with the 1:2:4 Structure", Physical Rev. B: vol. 39, #10, Apr. 1, 1989.
Hazen et al., "Crystal Structure of DyBa.sub.2 Cu.sub.4 O.sub.8 : A New 77K Bulk Superconductor", Appl. Phys. Lett., 54(11), pp. 1057-1059, Mar. 13, 1989.
Appl. Phys. Lett. (1988), vol. 52, pp. 1831-1833, "Improved Press Forging of Ba.sub.2 YCu.sub.3 O.sub.x Superconductor", Grader et al.
Japanese Journal of Applied Physics (1988), vol. 27, pp. L622-L624, "High-J.sub.C Superconducting Single Crystalline HoBaCuO Thin Films by . . . ", Tanaka et al.
Nature, vol. 334, Jul. 14, 1988, P. Marsh et al, "Crystal Structure of the 80K Superconductor YBa.sub.2 Cu.sub.4 O.sub.8," pp. 141-143.

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