Fine-particle bi-sr-ca-cu-o having high phase purity made by che

Details Fine-particle bi-sr-ca-cu-o having high phase purity made by che Fine-particle bi-sr-ca-cu-o having high phase purity made by che

1996-10-28

1999-01-26

Langel, Wayne

Superconductor technology: apparatus, material, process

High temperature , per se

Bismuth containing

423593, 505782, C01F 1102, C01F 1104

Patent

active

058638679

ABSTRACT:
In accordance with the invention a process is provided for achieving a phase-pure BSCCO or lead doped BSCCO powder or precursor of the 2201, 2212 or 2223 phase. In this process a cation solution is intimately mixed with an anion solution and precipitation is caused at a carefully controlled pH in the range from about 10 to about 12.5. The resulting product is filtered and dried or heat-treated at a temperature of from about 400.degree. to about 500.degree. C. for a period of from about 8 to about 12 hours. The heat-treated powder is then subjected to a second heat treatment at a reduced oxygen of from about 3 to about 10 torr and a temperature of from about 700.degree. to about 800.degree. to form a precursor powder. The precursor powder is heat-treated at ambient pressure in CO.sub.2 -free air from about 12 to about 31 hours or more at a temperature of from about 800.degree. to about 850.degree. C. A product results having a particle size of less than 5 microns, low carbon content and a phase purity of at least about 95 percent.

REFERENCES:
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patent: 5484766 (1996-01-01), Shah et al.
patent: 5716909 (1998-02-01), Majewski et al.
Akira Ono, "Synthesis of the 107 K Superconducting phase in the Bi-Sr-Ca-Cu-O System", Japanese Journal of Applied Physics, vol. 27, No. 7 (Jul., 1988), pp. L1213-L1215.
Naoki Uno et al, "Synthesis of Bi-Sr-Ca-Cu-O Superconductor by Vacuum Calcination Method,"Japanese Journal of Applied Physics,vol. 27, No. 6 (Jun., 1988), pp. L1013-L1014.
R. Escudero et al, "Isolation of the 110K Superconducting phase of Bi-Pb-Sr-Ca-Cu-O compounds,"Appl. Phys. Lett. 54 (16), 17 Apr. 1989, pp. 1576-1578.

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