Process for making high critical current density Bi.sub.2 CaSr.s

Details Process for making high critical current density Bi.sub.2 CaSr.s Process for making high critical current density Bi.sub.2 CaSr.s

1991-07-29

1993-04-20

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505742, 505782, C01F 1102, C01G 302, C01G 2900

Patent

active

052043177

ABSTRACT:
A method for making a high critical current density Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8 superconductor includes mixing suitable solid state reactants in amounts sufficient to create a reactant mixture having a ratio of approximately 4 Bi atoms:3 Ca atoms:3 Sr atoms:4 Cu atoms and oxygen. The reactant mixture is heated to a sufficient temperature for a sufficient time to sinter the reactant mixture and form a Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8 superconductor.

REFERENCES:
Takayama -"Identification of the Superconducting Phase in . . . ", Jap. Jnl. Appl. Phys. v.27(3) Mar. 1988, pp. L265-L368.
Urland, "Dependence of T.sub.c on Hole Concentration in Bi.sub.2 Sr.sub.3-x Ca.sub.x Cu.sub.2 O.sub.8+.delta. Superconductors", Solid State Conn. v.69(10) 1989, pp. 995-997.
Tarascon, "Crystal Substructure & Physical Properties . . . ", Phys. Rev. B, 1988.
Onoda, "Assignment of the Powder X-Ray Diffraction Pattern . . . ", Jap. Jnl. Appl. Phys. v.27(5) May 1988, pp. L833-L836.
Wang, "Production and Characterization of Single Crystal . . .", Solid State Comm. v.68(8), 1989, pp. 829-832.
Furcone, "Spin-on Bi.sub.4 Sr.sub.3 Ca.sub.3 Cu.sub.4 O.sub.16+x Superconducting . . . ", Appl. Phys. Lett. v.52(25) Jun. 20, 1988, pp. 2680-2682.
Ishida, "Critical Temperature Enhancement of Bi.sub.2 Sr.sub.2 CaCu.sub.2 O.sub.x . . . ", Appl. Phys. Lett. v.55(14) Oct. 2, 1989, pp. 1457-1459.

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