Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Using an organometallic intermediate
Patent
1991-07-09
1994-04-19
Silbaugh, Jan H.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Using an organometallic intermediate
264 5, 264 13, 505734, 505737, 505441, H01L 3912
Patent
active
053045360
ABSTRACT:
An improved process for preparing a superconducting composition having the formula M.sub.W A.sub.E Cu.sub.V O.sub.K wherein M is selected from the group consisting of 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 77K, 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 which can be formed into shaped articles.
REFERENCES:
patent: 4959347 (1990-09-01), Kobayashi et al.
patent: 5019555 (1991-05-01), Chin et al.
patent: 5021400 (1991-06-01), Block et al.
patent: 5039654 (1991-08-01), Mizuta et al.
Oesterreicher et al. "Superconductivity in Bi-Cu-Sr-Ca-O" Materials Letters vol. 6, No. 8.9 p. 254 May 1988.
Cheetham et al. "Control of Copper Valence in Bi.sub.2 Sr.sub.2-x CaCu.sub.2 O.sub.8 " Nature vol. 333 May 1988.
Hazen et al. "100-K Superconducting Phases in the Ti-Ca-Ba-Cu-O System" Physical Review Letters vol. 60, No. 16 Apr. 18, 1988.
Subramanian et al. "Crystal Structure of the High-Temperature Superconductor Tl.sub.2 Ba.sub.2 CaCu.sub.2 O.sub.8 " Nature vol. 332 Mar. 31, 1988.
E. I. Du Pont de Nemours and Company
Fiorilla Christopher A.
Silbaugh Jan H.
LandOfFree
Process for making superconductor powder 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 superconductor powder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making superconductor powder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-19759