Process for making high critical current density Bi.sub.2 CaSr.sub.2 Cu.sub. O.sub.8 superconductor
AssigneeUnited Technologies Corporation
InventorsFrancis S. Galasso, David A. Condit
Life of this patent
Estimating the term…
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.
Claims5
A method for making a high critical current density Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8 high T.sub.c superconductor, consisting essentially of sequentially:
- (a) 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;
- (b) loosely compacting the reactant mixture so the reactant mixture is sufficiently porous to permit oxygen to infiltrate to the interior of the reaction mixture;
- (c) heating the reactant mixture to a temperature between about 840.degree. C. and about 870.degree. C. in an oxygen-containing atmosphere;
- and
- (d) maintaining the reactant mixture at a temperature between about 840.degree. C. and about 870.degree. C. for at least about 2 days in the oxygen-containing atmosphere to sinter the reactant mixture and form a Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8 superconductor;
- wherein the superconductor has a high critical current density.
Dependencies are inferred from the claim text.