Process for preparing superconductor

Details Process for preparing superconductor Process for preparing superconductor

1989-07-19

1991-09-17

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505782, 501123, 252521, 423592, 423618, 423619, 423635, H01B 1200, H01L 3912

Patent

active

050495410

ABSTRACT:
Superconductors of the Bi-Pb-Sr-Ca-Cu-O system and Tl-Pb-Ba-Ca-Cu-O system having a high Tc phase (about 110K and about 125K, respectively, or more) at a high proportion are obtained by adding a calcium compound which forms CaO and a liquid phase at a temperature for firing the superconductors, e.g., Ca.sub.2 PbO.sub.x (x=3 or 4); or by starting form a composition represented by the formula: Bi.sub.2 Pb.sub.(n-1)/2 Sr.sub.2 Ca.sub.n Cu.sub.n+1 O.sub.b, or Tl.sub.2 Pb.sub.(n-1)/2 Ba.sub.2 Ca.sub.n Cu.sub.n+1 Ob where 2.ltoreq.n.ltoreq.10, 5.ltoreq.b.ltoreq.40.5, i.e., at a ratio of Ca:Pb=2:1.

REFERENCES:
Uota et al, "The effect of lead addition on superconductivity in Bismuth-Stromtium-calcium-copper oxide", Jpn. J. Appl. Phys, Part 2, 27(12), L2289-L2292 Dec. 1988.
Mizuno et al., "Superconductivity of Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 Pb.sub.x O.sub.y (x=0.2, 0.4, 0.6)" Jpn. J. Appl. Phy. vol. 27, #7, Jul. 1988, pp. L 1225-L1227.
Subramanian et al, "Crystal structure of the high-temperature superconductor Tl.sub.2 Ba.sub.2 CaCU.sub.2 O.sub.8 ", Nature vol. 332 Mar. 31, 1988.
T. Uzumaki et al., "The Effect of Ca.sub.2 PbO.sub.4 Addition on Superconductivity in a Bi-Sr-Cu-O System," Japanese Journal of Applied Physics, vol. 28, No. 1, Jan. 1989, pp. L75-L77.
M. Takano et al., "High-T.sub.c Phase Promoted and Stabilized in the Bi, Pb-Sr-Ca-Cu-O System," Japanese Journal of Applied Physics, vol. 27, No. 6, Jun. 1988, pp. L1041-L1043.
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Japanese Journal of Applied Physics, "Preparation of High-T.sub.c Tl-Ba-Ca-Cu-O Superconductors," vol. 27, No. 5, May 1988, pp. L804-L806.
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Japanese Journal of Applied Physics, "Effect of Oxygen Content and Sr/Ca Ratio on Superconducting Properties in Bi.sub.2 Sr.sub.2 -.sub.x Ca.sub.1 +Cu.sub.2 O.sub.8+ .delta.," vol. 27, No. 8, Aug. 1988, pp. L1442-L1444.
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Japanese Journal of Applied Physics, "Formation of a 100 K Superconducting Bi(Pb)-Sr-Ca-Cu-O Film by a Spray Pyrolysis", vol. 27, No. 9, Sep. 1988, pp. L1669-L1671.
Japanese Journal of Applied Physics, "Reproducible Processin for High-T.sub.c Superconducting Ti-Ba-Ca-Cu-O Phases," vol. 27, No. 9, Sep. 1988, pp. L1672-L1675.
7th Symposium on Future Electron Devices, "Research on Superconducting Electron Devices at Electrotechnical Laboratory (Invited)," Nov. 1-2, 1988, Tokyo, Japan, pp. 25-30.
Itoh et al, Japanese Journal of Applied Physics, "Formation and Degradation of the 120 K T.sub.c Phase in the Tl-Pb-Sr-Ca-Cu-O System," vol. 28, No. 4, Apr. 1989, pp. L591-594.

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