Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-02-11
1992-09-22
Dixon, Jr., William R.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505780, 505779, 252520, 501123, 501152, H01B 1206, C01G 300, C04B 4189, H01L 3912
Patent
active
051496836
ABSTRACT:
A method for producing an oxide superconductor formed according to a chemical composition formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8 and having a transition temperature of 77K or above, comprising the step of causing a reaction between (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z and a Cu material such as CuO, wherein R stands for one or more rare earth elements selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb, and wherein 0.01.ltoreq.x.ltoreq.0.25, 0.ltoreq.y.ltoreq.0.5, and 0.ltoreq.z.ltoreq.1. The advantage of this production method is that this production method does not require a hot static pressing process which takes a long time.
REFERENCES:
"Eight New High-temperature Superconductors with the 1:2:4 Structure", Morris et al, Physical Review B, vol. 39, No. 10, pp. 7347-7350.
Miyatake et al, "T.sub.c Increases to 90K in YBa.sub.2 Cu.sub.4 O.sub.8 by Ca Doping", Nature, vol 341 pp. 41-42, Sep. 7, 1989.
Karpinski et al., "Bulk Synthesis of the 81K Superconductor YBa.sub.2 Cu.sub.4 O.sub.8 at High Oxygen Pressure", Nature, vol. 336, Dec. 15, 1988, pp. 660-662.
Tsuchiya et al, "Effect of Doping Element on Superconductivity of YBa.sub.2 Cu.sub.3 O.sub.7-8 ", Eplindid Abstracts, MRS High Temperature Superconductor Symposium, Apr. 5-9, 1988 pp. 311-313.
Wada et al, "Preparations and Properties of Superconducting Y(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8 ", Phy. Rev. B. vol. 41 #6, Jun. 1, 1990.
R. G. Buckley, et al, "Calcium-Substituted Superconducting RBa2CU408 with Tc=90K Prepared at One Atmosphere", Physica C., vol. 165, No. 5/6, pp. 391-396, Feb. 1990.
S. Jin, et al, "Synthesis and Properties of the YBa2Cu408 Superconductor", Physica C., vol. 165, No. 5/6, pp. 415-418, Feb. 1990.
Ichinose Ataru
Suzuki Nobuo
Tanaka Shoji
Wada Takahiro
Yaegashi Yuji
Bonner M.
Central Research Institute of Electric Power Industry
Dixon Jr. William R.
International Superconductivity Technology Center
Matsushita Electric - Industrial Co., Ltd.
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