Method for preparing a single crystal of lanthanum cuprate

Details Method for preparing a single crystal of lanthanum cuprate Method for preparing a single crystal of lanthanum cuprate

1990-05-10

1991-10-15

Kunemund, Robert

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505729, 1566207, 15662073, 15662074, 423593, C30B 1302

Patent

active

050574922

ABSTRACT:
Lanthanum cuprate, La.sub.2 CuO.sub.4, is a superconductive oxide. In order to prepare a single crystal of lanthanum cuprate, the phase diagram of La.sub.2 O.sub.3 -CuO system is determined utilizing their differential thermal analysis and X-ray diffractometry. Cu oxide and at least one of lanthanum oxide and lanthanum carbonate are mixed in the molar ratio of 71.1-92.9:28.9-7.1. The resulting mixture is heated to be molten. While slowly cooling the melt, nuclei of La.sub.2 CuO.sub.4 precipitate from the melt, growing to single crystals in the melt. As a result, large scale single crystals are prepared.

REFERENCES:
patent: 3994690 (1976-11-01), Defosse
patent: 4235848 (1980-11-01), Sokolov et al.
Hidaka et al., Japanese Journal of Applied Physics, vol. 26, No. 4, Apr. 1987, pp. L377-L379.
Hidaka et al., Journal of Crystal Growth, vol. 85 (1987), pp. 581-584.
Hasegawa et al., Japanese Journal of Applied Physics, vol. 26 (May 1987), No. 5, Part 2, p. L673.
Matsuura et al., Japanese Journal of Applied Physics, vol. 23 (Aug. 1984), No. 8, Part 1, pp. 1143-1144.
Morris et al., Extended Abstracts, High-Temperature Superconductors II (MRS) Apr. 5-9, 1988, pp. 43-46.
Jiang et al., Extended Abstracts, High-Temperature Superconductors II (MRS), Apr. 5-9, 1988, pp. 125-128.
Inoue et al., Japanese Journal of Applied Physics, vol. 26, No. 5, May 1987, pp. L732-L733.
Kawabe et al., Single Crystal Growth of Superconducting Layered Perovskite Metal Oxides, (MRS) Apr. 1987, pp. 251-252.
Bykov et al., Journal of Crystal Growth, vol. 91, 1988, pp. 302-307.
Chen et al., Solid State Communications, vol. 66, No. 6, pp. 611-612, 1988.
Aselage et al., Extended Abstracts, High-Temperature Superconductors, (MRS) Apr. 23-24, 1987.
Pamplin, Crystal Growth, Pergamon Press, New York, 1980 (pp. 6-7).
Holland et al., Chemistry of High-Temperature Superconductors, American Chemical Society, Aug. 30-Sep. 4, 1987.
Delgado et al., "Sngle Crystal Structural Study of LaCuLiO.sub.4 ", Mat. Res. Soc. Symp. Proc., vol. 99, MRS 1988.
Shomoto et al., "Single Crystal Growth of High to Superconductors", Solid State Communications, vol. 68, NaZ, pp. 195-199, 1988.
Wanklyn et al., "The Flux Growth of Crystal of YBo.sub.2 Cu.sub.3 O.sub.7 ", Solid State Communications, vol. 66, No. 4, pp. 441-443, 1988.

Affiliated with

Also associated with

Rating

Method for preparing a single crystal of lanthanum cuprate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for preparing a single crystal of lanthanum cuprate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing a single crystal of lanthanum cuprate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-991137