Process for making superconductors using barium hydroxide

Details Process for making superconductors using barium hydroxide Process for making superconductors using barium hydroxide

1988-05-31

1991-10-29

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252521, 423593, 423604, 501123, 501152, 505734, 505737, 505738, C01B 1314, C01F 1102, C01G 302, H01L 3412

Patent

active

050616838

ABSTRACT:
There is disclosed an improved process for preparing a superconducting composition having the formula M.sub.w A.sub.z Cu.sub.v O.sub.x wherein M is selected from the group consisting if Bi, Tl, Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm Yb and Lu; A is at least one alkaline earth metal selected from the group consisting of Ba, Ca and Sr; x is at least 6; w is at least 1; z is at least 2 and v is at least 1; said composition having a superconducting transition temperature of above 77 K, preferably above about 90 K; said process consisting essentially of (a) forming a suspension having an M:A:Cu atomic ratio of w:z:v by mixing A(OH).sub.2, AO or AO.sub.2 and M.sub.2 O.sub.3 with an aqueous solution of cupric carboxylate or cupric nitrate at a temperature from about 50.degree. C. to about 100.degree. C., or mixing A(OH).sub.2 with an aqueous solution of Cu carboxylate, nitrate or a mixture thereof and M carboxylate, nitrate or a mixture thereof at a temperature from about 50.degree. C. to about 100.degree. C.; (b) drying the suspension formed in step (a) to obtain a precursor powder; and (c) heating and cooling the powder under specified conditions to form the desired superconducting composition. Shaped articles thereof are also disclosed.

REFERENCES:
patent: 4636378 (1987-01-01), Pastor et al.
patent: 4661282 (1987-04-01), Clark
patent: 4755493 (1988-07-01), Takeuchi et al.
Kawai, "Preparation of High- T.sub.z Y-Ba-Cu-O Superconductor", Jap. Jul. Appl. Phys., vol. 26, No. 5, May 1987, pp. L736-L737.
Politis, "Superconductivity Above Look in Multi-Phase Y-Ba-Cu-O", Z. Phys. B-Cond. Matter. 66, 1987, pp. 279-282.
Bednorz and Muller, Z. Phys., B64, 189-193 (1986).
Chu et al., Phys. Rev. Lett. 58, 405-407 (1987).
Chu et al., Science 235, 567-569 (1987).
Cava et al., Phys. Rev. Lett. 58, 408-410 (1987).
Rao et al., Current Science 56 47-49 (1987).
Bednorz et al., Europhys. Lett. 3, 379-384 (1987).
Wu et al., Phys. Rev. Lett. 58, 908-910 (1987).
Hor et al., Phys. Rev. Lett. 58, 911-912 (1987).
Sun et al. Phys. Rev. Lett. 58, 1574-1576 (1987).
Cava et al., Phys. Rev. Lett. 58, 1676-1679 (1987).
Takita et al., Jpn. J. Appl. Phys. 26, L506-L507 (1987).
Takabatake et al., Jpn. J. Appl. Phys. 26, L502-L503 (1987).
Syono et al., Jpn. J. Appl. Phys. 26, L498-L501 (1987).
Takayama-Muromachi et al., Jpn. J. Appl. Phys. 26, L476-L478 (1987).
Hosoya et al., Jpn. J. Appl. Phys. 26, L456-L457 (1987).
Hirabayashi et al., Jpn. J. Appl. Phys. 26, L454-L455 (1987).
Ekino et al., Jpn. J. Appl. Phys. 26, L452-L453 (1987).
Akimitsu et al., Jpn. J. Appl. Phys. 26, L449-L451 (1987).
Semba et al., Jpn. J. Appl. Phys 26, L429-L431 (1987).
Hatano et al., Jpn. J. Appl. Phys. 26, L374-L376 (1987).
Hikami et al., Jpn. J. Appl. Phys. 26, L347-L348 (1987).
Matsushita et al., Jpn. J. Appl. Phys. 26, L332-L333 (1987).
Maeno et al., Jpn. J. Appl. Phys. 26, L329-L331 (1987).
Iguchi et al., Jpn. J. Appl. Phys. 26, L327-L328 (1987).
Bourne et al., Phys. Letters A120, 20 494-496 (1987).
Moodenbaugh et al., Phys. Rev. Lett. 58, 1885-1887 (1987).
Hor et al., Phys. Rev. Lett. 58, 1891-1894 (1987).
Morgan, "Processing of Crystalline Ceramics", pp. 67-76.
C. Michel et al., Z Phys. B-Condensed Matter 68, 421 (1987).
Akimitsu et al., Jpn. J. Appl. Phys. 26, L2080 (1987).
H. maeda et al., Jpn. J. Appl. Phys. 27, L209 (1988).
Subramanian et al., Science 239, 1015 (1988).
L. F. Schneemeyer et al., Nature 332, 422 (1988).
S. Kondoh et al., Solid State Comm. 65, 1329 (1988).
Z. Z. Sheng et al., Nature 332, 55 (1988).
Z. Z. Sheng et al., Phys. Rev. Lett. 60, 937 (1988).
Z. Z. Sheng et al., Nature 332, 138 (1988).
R. M. Hazen et al., Phys. Rev. Lett. 60, 1657 (1988).
Subramanian et al., Nature 332, 420 (1988).

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1400607