Oxide superconductors

Details Oxide superconductors Oxide superconductors

1991-03-01

1994-04-05

Bell, Mark L.

Superconductor technology: apparatus, material, process

High temperature , per se

Thallium containing

505783, 501123, 501152, 252521, H01B 1200, H01L 3912, C04B 3500

Patent

active

053004825

ABSTRACT:
This invention provides an oxide superconductor having a composition of the following general formula of (Tl.sub.a Bi.sub.b Pb.sub.c).sub.x (Sr.sub.d Ba.sub.e).sub.2y (Ca.sub.f Ln.sub.g).sub.y(n-1) Cu.sub.wn O.sub.2n+3+.delta., wherein Ln is at least one selected from Y and rare earth elements, n is 2, 3 or 4, -1<.delta.1, 0.8.ltoreq.x.ltoreq.1.2, 0.8.ltoreq.y.ltoreq.1.2, 0.8.ltoreq.z.ltoreq.1.2 and 0.8.ltoreq.w.ltoreq.1.2, and if a, b and c all are not zero, i.e., greater than zero, a+b+c=1, d+e=1 and f+g=1, and 0<a.ltoreq.1, 0<b.ltoreq.1, 0<c.ltoreq.1, 0.ltoreq.d.ltoreq.1, 0.ltoreq.e.ltoreq.1, 0.3.ltoreq.f.ltoreq.0.99 and 0.01.ltoreq.g.ltoreq.0.7; if b is zero, a+b+c=1, d+e=1 and f+g=1, and 0<a.ltoreq.1, 0<c.ltoreq.1, 0<d<1, 0<e<1, 0.3.ltoreq.f.ltoreq.0.99 and 0.01.ltoreq.g.ltoreq.0.7; if c is zero, a+b+c=1, d+e=1 and f+g=1, and 0<a.ltoreq.1, 0<b.ltoreq.1, 0.ltoreq.d.ltoreq.1, 0.ltoreq.e.ltoreq.1, 0.3.ltoreq.f.ltoreq.0.99 and 0.01.ltoreq.g.ltoreq.0.7; if d and e both are not zero, a+b+c=1, d+e=1 and f+g=1, and 0.ltoreq.a.ltoreq.1, 0.ltoreq.b.ltoreq.1, 0.ltoreq.c.ltoreq.1, 0<d<1, 0<e<1, 0.3.ltoreq.f.ltoreq.1.0 and 0.ltoreq.g.ltoreq.0.7.

REFERENCES:
Huang et al. "Bulk Superconductivity of Thallium Bismuth Calcium Yttrium Strontiun Copper Oxide," Jap J. App Phy. Part 2, 28 (9) pp. L1514-L1417, 1989.
Materials Letters, vol. 7, No. 1, 2. Aug., 1988, pp. 1-4.
Japanese Patent Kokai (Laid-Open) No. 1-252538 Sep. 10, 1989.
Science, vol. 24, pp. 249-252 Oct. 1988.
Japan Journal of Applied Physics, vol. 27, pp. L2287-L2288 Dec. 1988.

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