Superconductor technology: apparatus – material – process – High temperature – per se – Copper containing
Patent
1991-08-23
1994-04-26
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Copper containing
252518, 252571, 505778, 505779, 505780, 505785, 505490, 505500, C01F 1102, C01F 1700, C01G 302, H01L 3912
Patent
active
053066979
ABSTRACT:
A superconductor material having a current density, J, of from about 30,000 to about 85,000 amps/cm.sup.2 at zero magnetic field and 77.degree. K. is disclosed. The 123 superconductor, of the formula L.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. wherein L is preferably yttrium, is capable of entrapping sufficiently high magnetic fields and exhibits a low microwave surface resistance. The process of preparing the superconductor comprises compacting the bulk product, L.sub.1 Ba.sub.2 Cu.sub.3 O, and then sintering the reaction product at a temperature between about 40.degree. C. to about 90.degree. C. below its melting point, i.e., for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. at a temperature of approximately 940.degree. C. The composition is then heated in a preheated chamber maintained at approximately 1090.degree. C. to about 1,200.degree. C. (approximately 1,100.degree. C. for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta.) until it has been decomposed, and is then rapidly cooled to a temperature between about 10.degree. C. to about 30.degree. C. above its melting point, i.e. for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub. 6 +.delta. a temperature of 1030.degree. C., and then is controlled cooled at a rate of 1.degree. C./hr until it reaches a temperature of about 20.degree. C. to about 40.degree. C. below its melting point, i.e., for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. a temperature of 980.degree. C. The composition is steadily held at this temperature for at least eight hours, and then cooled to a temperature of approximately 400.degree. C. below its melting point (for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.6 +.delta. approximately a temperature of 600.degree. C). The material is then slowly cooled by another 200.degree. C. and is then annealed in oxygen.
REFERENCES:
patent: 4824826 (1989-04-01), Damento et al.
patent: 4826808 (1989-05-01), Yurek et al.
patent: 4892861 (1990-01-01), Ray
patent: 4939121 (1990-07-01), Rybka
patent: 4943557 (1990-07-01), Ling
patent: 4952554 (1990-08-01), Jin
patent: 4973575 (1990-11-01), Capone
patent: 4975411 (1990-12-01), Danby et al.
patent: 4990493 (1991-02-01), Lay
patent: 5011823 (1991-04-01), Jin
patent: 5077272 (1991-12-01), Chen
patent: 5093314 (1992-03-01), Takahashi
patent: 5106829 (1992-04-01), Quadri
Ekin "Transport Critical Current in Bulk Sintered YBa.sub.2 Cu.sub.3 O.sub.x . . . " Adv. Cer. Mat'ls vol. 2 (3B) Jul. 1987 pp. 586-592.
Arendt "Aligned Sintered Compacts of RBa.sub.2 Cu.sub.3 O.sub.7 (R=Dy, Er . . . )" Mat. Res. Soc. Symp Proc. vol. 99, Dec. 1988, pp. 203-207.
Hidaka "Anisotropy of the Upper Critical Magnetic Field in Single Crystal YBahd 2Cu.sub.3 O.sub.7+y " Jap. Jnl. Appl. Phys. vol. 26(5) May 1987 pp. L726-L728.
Takada "Formation of Barium Copper Yttrium Oxide . . . " Chem. Abstracts 101 Aug. 1988, No. 8, p. 295.
McGinn "Texture Processing of YBa.sub.2 Cu.sub.3 O.sub.7-x . . . " Physica C vol. 156 Aug. 1, 1988 pp. 57-61.
Matsushita "Critical Current Densities in Superconducting . . . " Jap. Jnl. Appl. Phys. vol. 28 (9) Sep. 1989 pp. L1545-1548.
Lee "Epitaxial Growth of YBa.sub.2 Cu.sub.3 O.sub.7 Thin Films on LiNbO.sub.3 . . . " Appl. Phys. Lett. vol. 55 (12) Sep. 18, 1989 pp. 1261-1263.
Murakami "Critical Current and Stability of Epitaxially . . . " Kyoto Conf.: Special Sessions Dec., 1987 p. 2037.
People's Daily Dec. 30, 1988 Japan.
Robinson "IBM Superconductor Leaps Current Hurdle" Research News Jun. 5, 1987 p. 1189.
Jiang "Crystal Growth of Y-Ba-Cu-O Compound . . . " MR5 Symp.: Extended Abstracts Apr. 1988 pp. 125-128.
Sekine "Fabrication of Multifilamentary Y-Ba-Cu-O Oxide . . . " Appl. Phys. Lett. vol. 52 (26) June. 27, 1988 pp. 2261-2262.
Goyal "Cermets of the YBa.sub.2 Cu.sub.3 O.sub.7 Superconductors" Materials Letters vol. 6 (8 & 9) May 1988 pp. 257-260.
Garland "A Novel Metal Matrix-High Tc Superconducting Composite . . . " MR5 Symp.: Extended Abstracts Apr. 1988, pp. 319-321.
Weinstein, R., et al., "Persistent Magnetic Fields Trapped in High T.sub.c Superconductor", Applied Physics Letter, 56 (15), 1475-1477 (1990) no date provided.
Kennedy, W. L., et al., "Frequency-Dependence of the Microwave Surface Resistance of Ceramic Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.y ", Solid State Communications, 70:7, pp. 741-744, 1989 (Feb.).
Salama, K., et al., Applied Physics Letters, "High Current Density in Bulk YBa.sub.2 Cu.sub.3 O.sub.x Superconductor," 54 (23), pp. 2352-2354, 1989 (Jun.).
Murphy, D. W., et al., "Processing Techniques for the 93K Superconductor Ba.sub.2 YCu.sub.3 O.sub.y ", Science, vol. 241, pp. 922-930, 1988 (May).
Jin, S. et al., "Melt-textured Growth of Polycrystalline YBa.sub.2 Cu.sub.3 O.sub.7-.delta. with High Transport J.sub.c at 77K", Physical Review B, vol. 37, No. 13, pp. 7850-7854, 1988 (May).
Jin, S. et al., "Large Magnetic Hysteresis in a Melt-Textured Y-Ba-Cu-O Superconductor", Appl. Phys. Lett., vol. 54, No. 6, Feb. 6, 1989, pp. 584-586.
S. Jin et al., "High Critical Currents in Y-Ba-Cu-O Superconductors", Appl. Phys. Lett., vol. 52, No. 24, p. 2074 (1988) (May).
Wolsky et al, "The New Superconductors: Prospects for Applications", Scientific American, pp. 61-69, Feb. 1989.
Tajima et al, "Composition Dependence of the Physical Properties in the Superconducting Y-Ba-Cu-O System", Jap. Journal Applied Physics, vol. 26, No. 5, May 1987, L 845-847.
Marshall et al, "Ordered-defect Structure in Epitaxial YBa.sub.2 Cu.sub.3 O.sub.7-x Thin Film", Physical Review B, vol. 37, (16), Jun., 1988, pp. 9353-9358.
Kumakura et al, "Large Magnetization in YBa.sub.2 Cu.sub.3 O.sub.7 Prepared by Sintering High Temperatures", Jap. Journal of Appl. Phys. Lett., vol. 27(2), Feb. 1988, L188-L190.
Narayan et al, "Microstructure and Properties of YBa.sub.2 Cu.sub.3 O.sub.9-.delta. Superconductors with Transitions at 90 and near 290K", Appl. Phys. Lett. 51 (12). Sep. 1987, pp. 940-942.
Numata et al, "Fabrication of Multifilamentary Y-Ba-Cu-O Superconductors", Applied Physics Letters, 52(26), pp. 2261-2262, Jun. 27, 1988.
Yurek et al, "Direct Synthesis of a Metal/Superconducting Oxide Comopsite by Oxidation of a Metallic Precursor", Journal Electrochemical Society, pp. 2635-2636, 1987 (Aug.).
Katayama-Yoshida, "Growth of YBa.sub.2 Cu.sub.3 O.sub.7-.delta. Single Crystals", Japanese Journal of Applied Physics, 26 (12), pp. L2077-L2079, Dec. 1987.
S. Peterson, "Magnetic Inducement of Texture in Ba.sub.2 YCu.sub.3 O.sub.6.9 Particle Assemblies Under Cryogenic Conditions", Journal of American Ceramic Society, 71 (11), pp. 458-459, 1988 (Nov.).
Satchell et al, "High-Magnetic-Field Critical Currents in Thin Films of YBa.sub.2 Cu.sub.3 O.sub.7 ", Nature, vol. 334, pp. 331-333, Jul. 1988.
Ferreira et al, "Magnetic Field Alignment of High-T.sub.c Superconductors RBa.sub.2 Cu.sub.3 O.sub.7-.delta. (R=Rare Earth)", Applied Physics, A, vol. 47, pp. 105-110, 1988 (Aug.).
Chaurdhari et al, "Critical Current Measurement in Epitaxial Films of YBa.sub.2 Cu.sub.3 O.sub.7-x Compound", Physical Review Letters, 58 (25), pp. 2684-2686, 1987 (Jun.).
Taylor, "Sintering Time and Temperature for Ba.sub.2 YCu.sub.3 O.sub.7-x Superconductors", Material Research Society Symposium Proceedings, vol. 99, pp. 663-666, 1987 (Nov./Dec.).
Schneemeyer et al, "Superconductivity in YBa.sub.2 Cu.sub.3 O.sub.7 Single Crystals", Nature vol. 328, pp. 601-603, Aug. 1987.
G. S. Grader et al., "Improved Press Forging of Ba.sub.2 YCu.sub.3 O.sub.x Superconductor," Appl. Phys. Lett., vol. 52 (21), 1831 (1988) May 23, 1988.
I-Wei Chen et al., "Texture Development in YBa.sub.2 Cu.sub.3 O.sub.x by Hot Extrusion and Hot-Pressing," J. Am. Ceram. Soc., vol. 70, C-388 (1987) Dec. 1987.
Salama Kamel
Selvamanickam Venkatakrishnan
Boyd John
Lieberman Paul
University of Houston - University Park
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