Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-09-05
1993-06-08
Bell, Mark L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505779, 505780, 501152, 501126, 501123, 252521, H01B 1200, H01B 108
Patent
active
052179451
ABSTRACT:
The present invention provides an oxide superconductor which has a relatively high transition temperature T.sub.c. This superconductor has the chemical formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is with in the range of 0.1.ltoreq..times.0.5, y is within the range of 0.1.ltoreq. y .ltoreq.0.4 and z is within the range of 0.05 .ltoreq. z .ltoreq.(x/2+0.5). The invention further provides a method for producing the oxide superconductor which comprises firing a composition of the formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 .ltoreq..times..ltoreq.0.5 and y is within the range of 0.1 .ltoreq.y .ltoreq.0.4 at a temperature of from 750.degree. C. to the melting temperature of the composition under an oxygen partial pressure P(O.sub.2) of 0.001 atm .ltoreq.P(O.sub.2) .ltoreq.0.2 atm and then heat treating the composition to adjust the oxygen loss z to 0.05 .ltoreq.z .ltoreq.(x/2+0.5).
REFERENCES:
Y. Saito, "Preparation of High-Tc Oxide Superconductors-Fabrication of Bulk Ceramics," Oyobutsuri Applied Physics, vol. 57, No. 8, pp. 1217-1218, 1988.
M. Kosuge, et al, "Preparation and Physical Properties of Yl-xCal.lx Ba2-0.1xCu3Oy," Japanese Journal of Applied Physics, vol. 27, No. 6, pp. L1022-L1024, Jun. 1988.
F. Devaux, et al, "Thermoelectric power of high-Tc superconductors," Physical Review B, vol. 41, No. 13, pp. 8723-8731, May 1990.
T. Wada, et al, "Substitution Effect of Sr for Ba of High-Tc Superconducting YBa2Cu307-y Ceramics," Japanese Journal of Applied Physics, vol. 26, No. 5, pp. L706-L708, May 1987.
J. M. Tarascon, et al, "Oxygen and rare-earth doping of the 90-K superconducting perovskite YBa2Cu307-x," Physical Review B, vol. 36, No. 1, pp. 226-234, Jul. 1987.
Ichinose Ataru
Suzuki Nobuo
Tanaka Shoji
Wada Takahiro
Yaegashi Yuji
Bell Mark L.
Bonner C. M.
Central Research Institute of Electric Power Industry
International Superconductivity Technology Center
Matsushita Electric - Industrial Co., Ltd.
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