Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1987-08-25
1989-08-15
Albrecht, Dennis
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
156DIG63, 252518, 252521, 423263, 423593, 423604, 423636, 501123, 501152, 505809, 505810, 505815, 505822, C01F 1700, C01G 302, C04B 3562, H01L 3912
Patent
active
048575046
ABSTRACT:
A class of melt-produced, high temperature suerpconductors and processes of making same are provided. The superconductor has a preferred composition of R-Ba-Cu-O wherein R is chosen from the group of rare earth metals excluding: Praseodyium; Cerium; and Terbium. The process is carried out at a relatively low temperature of about 950.degree. C., and the process allows fabrication of melt-produced high temperature superconductors of arbitrary shape. The process is based on the reaction between molten barium-copper oxides and solid rare earth oxides, rare earth barium oxides, rare earth copper oxides, or rare earth barium-copper oxides. In an embodiment, the method comprises the steps of: mixing and grinding BaCO.sub.3 and CuO with other nominal compositions; pressing the resultant mixture into a pellet, if necessary; placing the pellet or powder on a pellet or powder that can include rare earth copper oxides; heating the pellet and/or powders to a temperature of approximately 950.degree. C.; and removing a melt-produced superconductor from the remaining powder or pellet.
REFERENCES:
Frase, K. G. et al., "Phase Incompatibilities in the System Y.sub.2 O.sub.3 -BaO-CuO", Adv. Ceramic Matls., vol. 12, No. 3B, Special Issue, Jul. 1987, pp. 295-302.
Roth, R. S. et al., "Phase Equilibria . . . Ba-Y-Cu-O", Adv. Ceramic Matls., vol. 2, No. 3B, Special Issue, Jul. 1987, pp. 303-312.
Wang, G. et al., "950.degree. C. Subsolidus Phase Diagram . . . Air", Adv. Ceramic Matls., vol. 2, No. 3B, Special Issue, Jul. 1987, pp. 313-326.
B. Bender et al., "Processing and Properties of the High T.sub.c Superconducting Oxide Ceramic YBa.sub.2 Cu.sub.3 O.sub.7 ", Advanced Ceramic Materials, vol. 2, No. 3B, Jul. '87.
Hasegawa, T., High Tc Superconductivity of (Lathd 1-xSr.sub.x).sub.2 CuO.sub.4 -Effect of Substitution of Foreign Ions for Cu and La on Superconductivity, Japan Journal Applied Physcis, 26, No. 4, Apr. 20, 1987, L-337-338.
Kishio, K., Effect of Lanthanide Ion Substitutions for Lanthanum Sites on Superconductivity of (La.sub.1-x Sr.sub.x).sub.2 CuO.sub.4 S, Japan Journal of Applied Physics, 26, No. 4, Apr. 20, 1987, L391-L393.
Ohsima, S., Superconducting and Structural Properties of the New Ba.sub.1-x Ln.sub.x CuO.sub.3-y Compound System (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Yb), Japan Journal Applied Physics, 26, No. 5, May 20, 1987, L815-L817).
Tsurumi, S., High Tc Superconductivities of A.sub.2 Ba.sub.4 Cu.sub.6 O.sub.14, Japan Journal Applied Physics, 26, No. 5, L856-857.
Superconductivity News, vol. 1, No. 2, Aug. 1987, pp. 1, 2, and 6-8.
K. N. Yang, High Temperature Superconductivity in Rare Earth (R)-Barium Copper Oxides (RBa.sub.2)Cu.sub.3 O.sub.9 -S, Solid State Communications, vol. 63, No. 6, pp. 515-519, (1987).
J. M. Tarascon, Oxygen and Rare-Earth Doping of the 90-K Superconducting Perovskite YBa.sub.2 Cu.sub.3 O.sub.7-x, The American Physical Society, 1987, vol. 36, No. 1.
P. H. Hor, Superconductivity Above 90 K in the Square-Planar Compound System ABa.sub.2 Cu.sub.3 O.sub.6+x with A=Y, La, Nd, Sm, Eu, Gd, Ho, Er, and Lu, The American Physical Society, 1987, vol. 58, No. 18.
A. Khurana, Suerpconductivity Seen Above the Boiling Point of Nitrogen, Physics Today, Apr. 1987.
R. J. Cava, Bulk Superconductivity of 91 K in Single-Phase Oxygen-Deficient Perovskite Ba.sub.2 YCu.sub.3 O.sub.9-S, The American Physcial Society, 1987, vol. 58, No. 16.
Hermann Allen M.
Sheng Zhengzhi
Albrecht Dennis
University of Arkansas
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