Process for producing a high-temperature superconductor

Details Process for producing a high-temperature superconductor Process for producing a high-temperature superconductor

1991-03-28

1992-11-10

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505782, 501123, 501126, 252521, 423529, 423635, C04B 3550, C04B 3564, H01B 1200

Patent

active

051623005

ABSTRACT:
To produce a high-temperature superconductor of the composition Bi.sub.(2+a) (Sr.sub.(1-b) Ca.sub.b).sub.(3-a) Cu.sub.(2+c) O.sub.(8+x), where a is from 0 to 0.3, b is from 0.1 to 0.9 and c is from 0 to 2, and x has a value which depends on the oxidation state of the metals contained, oxides and/or carbonates of bismuth, strontium, calcium and copper are thoroughly mixed. In this process, the copper compound is used as a mixture of copper(I) oxide and copper(II) oxide. Then the mixture of oxides and/or carbonates is first allowed to react mutually in an inert gas atmosphere at temperatures from 700.degree. to 800.degree. C. for 0.5 to 36 hours before subsequently treating the mixture in an oxygen-containing atmosphere at temperatures from 700.degree. to 875.degree. C. for 3 to 60 hours.

REFERENCES:
Kato et al., "Superconductivity of Bismuth Strontium Calcium Copper Oxides Prepared from Cupric and Cuprous Oxide and Doped with Silver Ions", MRS Symp. Proc. 169, pp. 337-340, 1990.
World Patent Index Latest, 89-096338, Derwent, London 1989.

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