Process for making 90 K superconductors

Details Process for making 90 K superconductors Process for making 90 K superconductors

1990-05-24

1991-07-30

Derrington, James

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

264 65, 252521, 505739, 505780, H01L 3912

Patent

active

050360434

ABSTRACT:
There is disclosed an improved process for preparing a superconducting composition having the formula MBa.sub.2 Cu.sub.3 O.sub.x wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu; x is from about 6.5 to about 7.0; said composition having a superconducting transition essentially of mixing M.sub.2 O.sub.3, BaO.sub.2 and CuO in an atomic ratio of M:Ba:Cu of about 1:2:3 to obtain a powder mixture; heating the resulting mixture in an oxygen-containing atmosphere at a temperature from about 850.degree. C. to about 925.degree. C. for a time sufficient to form MBa.sub.2 Cu.sub.3 O.sub.y, where y is from about 6.0 to about 6.4; and maintaining the MBa.sub.2 Cu.sub.3 O.sub.y in an oxygen-containing atmosphere while cooling for a time sufficient to obtain the desired product.

REFERENCES:
patent: 4766010 (1988-08-01), Takeuchi et al.
Politis et al., "Superconductivity "at 40 in Laie Sto.z C.sub.4 O.sub.4 Condensed Matter, Spring 1987, vol. 66, pp. 141-146.
Hor et al., Physical Review Letters, vol. 58, No. 18, pp. 1891-1894, 4 May 1987.
Tarascon et al., Physical Review B, vol. 36, No. 1, pp. 226-234, 1987.
Navek et al., Mat. Res. Bull., vol. 24, pp. 283-287, 1989.
Z. Phys. B64, 189-193 (1986), Bednorz et al.
Phys. Rev. Lett. 58, 405-407 (1987), Chu et al.
Science 235, 567-569 (1987), Chu et al.
Phys. Rev. Lett. 58, 408-410 (1987), Cava et al.
Current Science 56, 47-49 (1987), Rao et al.
Europhys. Lett. 3, 379-384 (1987), Bednorz et al.
Phys. Rev.Lett. 58, 908-910 (1987), Wu et al.
Phys. Rev. Lett. 58, 405-407 (1987), Chu et al.
Phys. Rev. Lett. 58, 911-912 (1987), Hor et al.
J.C.S. Dalton 1061-1066 (1975), Arjomand et al.
Phys. Rev. Lett. 58, 1574-1576 (1987), Sun et al.
Phys. Rev. Lett. 58, 1676-1679 (1987), Cava et al.
Hepp et al., "Inert Atmosphere Preparation of Ba.sub.2 YCu.sub.3 O.sub.7-x Using BaO.sub.2 ", Mat. Res. Bull., vol. 23, pp. 697-700 (1988).
Brinker et al., Eds., "Better Ceramics Through Chemistry III" Materials Research Society Symposium Proceedings, vol. 121, pp. 385-389 (1988).

Affiliated with

Also associated with

Rating

Process for making 90 K superconductors 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 making 90 K superconductors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making 90 K superconductors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1542650