Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-08-15
1990-07-24
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423604, 423635, 501123, 502341, 502346, 505742, 505780, C01B 1300, C01F 1700, C01G 302, C04B 3500
Patent
active
049435574
ABSTRACT:
In a process for making the superconductive composition YBa.sub.2 Cu.sub.3 O.sub.x, cupric carbonate or cupric oxalate is used as the copper source and barium carbonate as the barium source to achieve higher densification.
REFERENCES:
"Proceedings and Superconducting Properties of Perovskite Oxides," by J. M. Tarascon et al., pp. 498-505, Advanced Ceramic Materials, vol. 2, No. 3B Special Issue, 1987.
"Synthesis, Characterization, and Fabrication of High Temperature Superconducting Oxides," by E. C. Behrman et al., pp. 539-555, Avanced Ceramic Materials, vol. 2, No. 3B, Special Issue, 1987.
Tien "Hot Isostatic Pressing (HIP) for the Densification of Oxide Superconductors"; Supercond. Its Appl., Proc. Annu. Conf. Super. Appl. 2nd, 1988 pp. 73-76.
Rauhala "Ion Beam Analysis of Oxygen Distribution in . . . YBa.sub.2 Cu.sub.3 O.sub.x " Appl. Phys. Lett. vol. 52(18) May 2, 1988, pp. 1520-1522.
Matthews "Increased Transition Temperatures in YBa.sub.2 Cu.sub.3 O.sub.y . . . " Nature vol. 328, Aug. 27, 1987, pp. 786-787.
Shyu "Annealing Effects on Properties of High T.sub.c YBa.sub.2 Cu.sub.3 O.sub.7 " Mat. Res. Soc. Symp. Proc. vol. 99, Nov.-Dec. 1987, pp. 655-658.
Voigt "A Hydroxycarbonate Route to Superconductor Precursor Powders" Mat. Res. Soc. Symp. Proc., vol. 99, Nov.-Dec. 1987, pp. 635-638.
Beech "Neutron study of the crystal structure . . . Ba.sub.2 YCu.sub.3 O.sub.9-.delta. " Physical Review B vol. 35, No. 16, Jun. 1, 1987, pp. 8778-8781.
Kuwabara "Preparation of High-T.sub.c Superconducting Y-Ba-Cu-O Ceramics . . . " Jap. Jnl. Appld. Physics vol. 26, No. 11, Nov. 1987, pp. L1821-L1823.
Patel "Electrical, Mechanical and Ultrasonic Properties of a" Advanced Ceramic Materials vol. 2, No. 3B, Special Issue, Jul. 1987, pp. 615-623.
Taylor "Sintering time and temperature for Ba.sub.2 YCu.sub.3 O.sub.7-x " MRS Symp. Proceeding: High T.sub.c -Super. vol. 99, Dec. 1987, pp. 663-666.
Nakahara "On the Defect Structure of Grain Boundaries in Ba.sub.2 YCu.sub.3 O" Mat. Res. Soc. Symp. Proc. vol. 99, Dec. 1987, pp. 575-578.
Parmigiani "Observation of Carboxylic Groups in the Lattice of . . . Ba.sub.2 YCu.sub.3 O" Physical Rev. B vol. 36, No. 13, Nov. 1987, pp. 7148-7150.
Uno "Synthesis of Superconductive Oxides by Vacuum Calc." Jap. Jnl. Appld. Phys. vol. 27, No. 6, Jun. 1988, pp. L1003-L1006.
AT&T Bell Laboratories
Boyd John
Levy Robert B.
Lieberman Paul
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