Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1990-03-21
1991-10-22
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
505782, 505809, C03C 1002
Patent
active
050595601
ABSTRACT:
A glass-ceramic superconductor is disclosed, having a nominal stoichiometric composition consisting essentially of the oxides of Bi, Ca, Sr, Cu and Zn in the stoichiometric formula range: Bi.sub.2 Ca.sub.x Sr.sub.z Zn.sub.n Cu.sub.w O.sub.y, wherein x ranges about 1-2, z ranges about 1-2, n ranges about 0.001-2, w ranges about 1-2, and y ranges about 6-11. These compositions exhibit greatly improved glass stability, yet can yield highly crystalline superconductors which may include large platelet crystals and which can exhibit very low room temperature resistivity.
REFERENCES:
Kometsu et al.; "High Tc Superconducting Glass Ceramics Based on the Bi--Ca--Sr--Cu--O System", Japanese Journal of Applied Physics, vol. 27, No. 4 Apr. 1988, pp. L550-552.
Inoue et al.; "Production of Bi--Sr--Cr--Cu--O glasses by Liquid Quenching and their Glass Transition and Structural Relaxation", Japanese Journal of Applied Physics, vol. 27, No. 6, Jun. 1988, L 941-942.
Matsushita, et al.; "Superconductor Glass-Ceramic by Melting-Quenching Method", Japanese Nikken Kogyo News, Mar. 16, 1988.
Abe, et al.; "Superconducting Glass--Ceramic Rods in BiCaSrCu.sub.2 O.sub.x prepared by crystallization under a Temperature Gradient"; applied Physics Letters 53(14) Oct. 3, 1988, pp. 1341-1342.
Akamatsu, et al. "Instanteous Preparation of Superconducting Thick Films Through Melt in the Bi--Cr--Sr--Cu--O System"; Japanese Journal of Applied Physics vol. 27, No. 9, Sep. 1988, pp. L1696-1698.
Alexander M. Grayson
Beall George H.
Quinn Candace J.
Yu C. John
Bell Mark L.
Corning Incorporated
VAN DER Sterre Kees
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