Process for preparing a novel superconductor with high density a

Details Process for preparing a novel superconductor with high density a Process for preparing a novel superconductor with high density a

1988-06-09

1990-11-20

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 419 53, 423605, 423635, 501123, 505725, 505742, C01F 100, C01F 1700, C01G 302, C04B 3560

Patent

active

049719467

ABSTRACT:
There is disxlosed a process for preparing a novel superconducting material. This material has the formula YBa.sub.2 Cu.sub.3 O.sub.7-x wherin x is equal to or less than 0.3, the material has a bulk density of from about 90 to about 96 percent, and the hardness of the material is in excess of 5.0 GigaPascals.
In the first step of the process, there is provided a pure powder comprised of barium, yttrium, and copper in a mole ratio of 2/1/3. Such powder is comprised of less than 1.0 mole percent of impurity.
In the second step of the process, the powder is compacted. Thereafter, the compacted powder is fired at a temperature of from about 1,000 to about 1,300 degrees Clesius for a period not exceeding 12 hours.

REFERENCES:
Katayama-Yoshida "Growth of Y Baz Cu.sub.3 O.sub.7-d Single Crystals", Jp. Jnl. of App. Phys. vol. 26 (12) Dec. 1987, pp. L2007-L2009.
Ishizawa "Superconducting Proerties of Highly oriented . . . ", Jap. Jnl. Appl. Phys. vol. 26, No. 5, May 1987, p. L676-L677.
Swaminathan "Thermal Stability of Superconducting YBaz Cu.sub.3 O.sub.7-X ", Materials Lettters vol. 6, No. 8,9, May 1988.
Matacotta "Determination of the Oxy. content In . . . YBa.sub.2 Cu.sub.3 O.sub.7-X . . . ", Mat. Res. Soc. Symp. Proc. vol. 99, 1988 Nov. 30-Dec. 4, 1987, pp. 561-565.
Shi "Sintering of Y Ba.sub.2 Cu.sub.3 O.sub.7-x Compacts", Argonne National Laboratory recieved 3/22/88.
Shyu et al. "Amealing Effects on Properties of . . . YBa.sub.2 Cu.sub.3 O.sub.7-X . . . ", Mot. Res, Soc. Symp. Proc. vol. 99:1988, 11/30-12/4/87, pp. 655-658.
Han "Electrical Conductivity and thermograuimetic Studies of . . . YBu.sub.2 Cu.sub.3 O.sub.x ", Mot. Res. Soc. Symp. Proc. vol. 99:1988 11/30-12/4/87 pp. 753-756 .
Tien "Hot Isostatic Pressing (HIP) For the Densification of Oxide Super", Ex. Abstracts High-temp. Super. II, Apr. 5-9 1988, pp. 73-76.
Politis "Superconducitvity above 100K in Multi-Phase Y-Br-Cu-O", Z. Phys. B-Condensed Matter 66 pp. 279-282, 1987 .
Dinger "Fracture Toughness Measurement of YBa.sub.2 Cu.sub.3 O.sub.x Single Crystals", IBM Yorktown Heights, 7/1987 (recieved) Preprint: pp. 2-11.
Greedan "Crystal Structures and Supercon. in La-Ba-Cu.sub.3 -O System", Mat. Res. Soc. Symp. Proc: 1988 11/30-12/4/89 pp. 749-752,
Kubo "Effect of Oxy. Deficiency on the Crystal Structure . . . Ba.sub.2 Cu.sub.3 O.sub.y ", Jpn. Jnl of applied Phys. vol. 26(5) May 1987, p.L768-L770.
Mckittrick "apid Solidification of YBa.sub.2 Cu.sub.3 O.sub.7 . . . ", Mat. Res. Soc. Symp. Proc. vol. 94:1989 11/30-12/4/87 pp. 567-570.
Nyang "Porosity, density and hardness of Y-Ba-Cu high Tc syper.", Jnl of. Mat. Sci Letters 7 4/1988 pp. 801-803.
Patel "Electrical, Mechanical and Ultra Sonic Properties of Sintering aid . . . ", Adv. Cer. Mat'ls vol. 2, No. 3B, Special Issue 1987, p. 615-623.
Kumakura "Large Magnetiazation in YBa.sub.2 Cu.sub.3 O.sub.7 Prepared . . . ", Jap. Jnl. of App. Phys. Lett. vol. 27, No. 2, Feb. 1988, pp. L188-L190.
Taylor "Sintering Time and Temperature for Ba.sub.2 YCu.sub.3 O.sub.7-x ", MrS: vol. 99 Nov. 30-Dec. 4, 1987, pp. 663-666.
Serverin "Microcracking and Mechanical Properties of Y Bu.sub.2 Cu.sub.3 O.sub.x . . . ", British Ceramic Proceedings vol. 40, 1988, pp. 249-256.

Affiliated with

Also associated with

Rating

Process for preparing a novel superconductor with high density a 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 a novel superconductor with high density a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing a novel superconductor with high density a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-454337