Production of a superconductor powder having a narrow melting tr

Details Production of a superconductor powder having a narrow melting tr Production of a superconductor powder having a narrow melting tr

1991-04-09

1992-09-22

Clingman, A. Lionel

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252521, 423604, 423635, 505742, 505776, 505779, C01D 1102, C01D 1100, C01G 302

Patent

active

051496844

ABSTRACT:
A process for preparing a superconductor-coated substrate including calcining a mixture of powdered yttrium or rare earth oxide (R), barium carbonate and copper oxide in a controlled atmosphere and in accordance with a predetermined temperature profile to form a superconductor powder having a stoichiometric ratio of R-Ba-Cu of approximately 1-2-3. The melting transition width of the resulting powder is relatively narrow, such that the melting onset temperature is above the high temperatures advantageously used to sinter the powder on the substrate.

REFERENCES:
patent: 4943557 (1990-07-01), Ling
patent: 4983571 (1991-01-01), Rao
patent: 5021395 (1991-06-01), Druliner
patent: 5049542 (1991-09-01), Bruss
Qadri "X-ray identification of the superconducting high Tc . . . " Physical Review B vol. 35, No. 13 May 1, 1987, pp. 7235-7237.
Uno "Synthesis of Superconducting Oxides by Vacumm . . . " Jap. Jnl. Appl. Physics vol. 27 (6) Jun. 1988, pp. 1003-1006.
Iguchi "Structural & Superconducting Properties of Yba.sub.2 Cu.sub.3 O.sub.7 . . . " Jap. Jnl. Appl. Phys. vol. 27(6) Jun. 1988, pp. L992-:995.
Balachandran, U., et al. Synthesis of Ceramic Superconductors Under Low Oxygen Pressure. Argonne National Laboratory, Dec. 1989.
Balachandran, U., et al. Synthesis of Phase-Pure Orthorhombic YBa.sub.2 Cu.sub.3 O.sub.x Under Low Oxygen Pressure. Argonne National Laboratory, Aug. 1989.

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