Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1992-04-20
1993-12-14
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423593, 505725, 505780, C01F 1102, C01F 1700, C01G 302, H01L 3924
Patent
active
052702952
ABSTRACT:
A process for preparing a composition having the general formula REBa.sub.2 Cu.sub.4 O.sub.y where RE is a rare earth element such as dysprosium and including yttrium and the subscript "y" is about 8.0. The process utilizes nitric acid among the starting components to provide control over stoichiometry and minimize contamination. The present invention is also directed to a process of preparing a high purity superconductor utilizing the composition thus prepared. This process permits the superconductor to be prepared in a short time and at low sintering temperatures.
REFERENCES:
patent: 4956340 (1990-09-01), Kimura et al.
patent: 4962088 (1990-10-01), Micheli et al.
patent: 4997810 (1991-03-01), Spencer
patent: 5024992 (1991-06-01), Morris
patent: 5149683 (1992-09-01), Wada
Jin "Synthesis and properties of the YBa.sub.2 Cu.sub.4 O.sub.8 Superconductor" Physica C vol. 165 Feb. 15, 1990 pp. 415-418.
Murakami, et al. Jap. Journ. of Applied Physics vol. 29, No. 3 Mar., 1990, pp. L445-L446 Synthesis of YBa.sub.2 Cu.sub.4 O.sub.8 Powders by Sol-Gel Method under Ambient Pressure.
Miyatake, et al. Physica C 160 (1989) pp. 541-544 Preparation and Superconducting Properties of YBa.sub.2 Cu.sub.4 O.sub.8.
Balachandran, et al. Physica C 165 (1990) pp. 335-339 Synthesis of 80K Superconducting YBa.sub.2 Cu.sub.4 O.sub.8 Via a Novel Route.
Morris, et al. Physical Review B vol. 39, No. 10 Apr. 1989 Eight new high-temperature superconductors with the 1:2:4 structure.
Niska, et al., Journal of Materials Science Letters 9 (1990) pp. 770-771 Formation of the 124 phase superconductor YBa.sub.2 Cu.sub.4 O.sub.8 by retaining oxygen in a reaction HIP sintering process.
Cara "Synthesis of bulk superconducting YBa.sub.2 Cu.sub.y O.sub.x . . . " Nature vol. 338 Mar. 23, 1989 pp. 328-330.
Copper "High-Tc superconductivity oxide films produced . . . " Math. Res. Soc. Symp. vol. 99 Nov./Dec. 1987 pp. 165-170.
Gupta "YBa.sub.2 Cu.sub.y O.sub.x thin films grown by a simple spray . . . " Appl. Phys. Lett. vol. 52(2) Jan. 11, 1988 pp. 163-165.
Hurng "Formation mechanism study of REBa.sub.2 Cu.sub.y O.sub.x. . . " Appl. Phys. Lett. vol. 57(19) Nov. 5, 1990 pp. 2025-2027.
Huang Yao T.
Hurng Weir M.
Shei Cheng Y.
Wu Sheng F.
Boyd John
Industrial Technology Research Institute
Lieberman Paul
LandOfFree
Process for preparing superconductors and compositions useful th does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing superconductors and compositions useful th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing superconductors and compositions useful th will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1705637