Method of preparing bismuth oxide superconductor comprising heat

Details Method of preparing bismuth oxide superconductor comprising heat Method of preparing bismuth oxide superconductor comprising heat

1991-08-08

1993-08-17

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

264 60, 505740, 505782, C01F 1102, C01G 302, C01G 2900, H01L 3924

Patent

active

052368912

ABSTRACT:
Disclosed herein is a method of preparing a bismuth oxide superconductor by forming a superconducting phase having a 2223 composition or a 2212 composition in a composition of Bi-Sr-Ca-Cu or (Bi,Pb)-Sr-Ca-Cu in a metal sheath. This method comprises the steps of preparing raw material powder containing a mixture of a 2212 phase having the 2212 composition and non-superconducting phases, carrying out a process of heat treating the raw material powder under a reduced pressure of not more than 1 atm. immediately before filling the same into the metal sheath and thereafter cooling the same under an oxygen atmosphere, and filling the raw material powder into the metal sheath and thereafter performing deformation processing and heat treatment on the metal sheath. This method is suitable for preparation of a long wire.

REFERENCES:
patent: 5093314 (1992-03-01), Takahashi
Uno "Synthesis of Bi-Sr-Ca-Cu-O Superconductors by Vacuum Calcination . . . ", Jap. Jnl. Appl. Phys. v. 27(6), Jun. 1988, pp. L1013-L1014.
Soeta "Microstructures of YBa.sub.2 Cu.sub.3 O.sub.7 with various critical . . . ", pp. 243-245.
Extended Abst: High Temp Superconductors II Apr. 5-9, 1988.
McCallum "Problems in the production of YBa.sub.2 Cu.sub.3 O.sub.x . . . ", Adv. Ceramic Mat'ls. v. 2(3B) 1987, pp. 388-400.
H. Sekine et al "Studies On The Non Rare Earth Oxide Superconductors Fabricates By Sintering" IEEE Transactions on Magnetics, vol. 25, No. 2, Mar. 1989, pp. 2164-2167 *Experimental Procedure*.

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