Method for increasing Tc of oxide superconductors

Details Method for increasing Tc of oxide superconductors Method for increasing Tc of oxide superconductors

1991-04-03

1992-09-15

Lusignan, Michael

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505725, 505782, 427 62, 427343, B05D 512

Patent

active

051478501

ABSTRACT:
The present invention provides a process for producing a superconducting material capable of elevating the Tc of oxide superconductors, in particular Bi-based superconductors. The feature of the present invention resides in a process for producing an oxide superconductor, in which a intermediate product or a product showing superconducting property is treated with a solution containing a compound having a reducing or oxidizing function. As the compound having a reducing function, compounds having two or more enolic hydroxy groups, cycloaliphatic polyhydric alcohol compounds or inorganic type reducing compounds are preferred. As the compound having oxidizing function, there can be mentioned, for example, carbonyl compounds, ozone, hydrogen peroxide, organic peroxide, dimethylsulfoxide and permanganate.

REFERENCES:
patent: 4959347 (1990-09-01), Kobayashi et al.
Ishida et al, "Critical Temperature Enhancement of Bi.sub.2 Sr.sub.2 CaCuO.sub.x by Phendization", Appl. Phys. Lett. 55(14) Oct. 1989, pp. 1457-1459.
Japanese Journal of Applied Physics, vol. 28, No. 2, Feb. 1989, pp. L217-L218, Hayashi et al: "A New Method for Improving the Superconducting Transition Temperature of Platy . . . ".
Materials Letters, vol. 9, No. 4, Feb. 1990, pp. 154-156 Murthy et al: "A new Coprecipitation Technique for the Preparation of Superconducting Oxides."

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