Process for the preparation of a semiconductor from an oxalate

Details Process for the preparation of a semiconductor from an oxalate Process for the preparation of a semiconductor from an oxalate

1990-09-07

1995-10-10

Bell, Mark L.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With precipitating from solution

505738, 501152, 501123, C04B 35505, C04B 3545

Patent

active

054570883

ABSTRACT:
To prepare a phase-pure, ceramic oxide superconductor which contains, in addition to copper, at least one alkaline earth metal from the group comprising Ba, Sr and Ca, and at least one metal from the group comprising Y, La, Tl, Pb and the rare earths, for example of YBa.sub.2 Cu.sub.3 O.sub.7-x, a solution is prepared which contains the metal components in the atomic ratios of the superconductor. The metals are precipitated as oxalates by combining this solution with an oxalic acid solution, the mixture of the oxalates is separated off, dried and decomposed to form the oxides, and the latter are subsequently sintered at temperatures of from 700.degree. to 900.degree. C. in the presence of oxygen to form the superconductor. In this process, the heating of the metal oxalates and the oxides formed therefrom up to 700.degree. C. is carried out at a maximum oxygen partial pressure of 50 mbar, preferably in an inert gas.

REFERENCES:
patent: 4804649 (1989-02-01), Sherif
patent: 4898851 (1990-02-01), Michel
patent: 4923849 (1990-05-01), Sherif
patent: 4956340 (1990-09-01), Kimura et al.
"Synthesis of Superconductive Oxides by Vacuum Calcination Method" Uno et al.--Jap. J. of App. Phys. pp. L1003-L1006 vol. 27, No. 6, Jun. 1988.
"Effect of Residual Water on Superconductivity in (La.sub.1-x Sr.sub.x).sub.2 CuO.sub.4-8 " Kisnio et al. Jap. J. of Applied Phys. vol. 26 #4 Apr. 1987 pp. L466-L467.
Journal of the American Ceramic Society, vol. 72, No. 4, Apr. 1989, pp. 696-698, K. W. Lang: "Formation of Yttrium Barium Cuprate Powder at Low Temperatures".

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