Homogeneous coprecipitation method for preparing YBaCuO supercon

Details Homogeneous coprecipitation method for preparing YBaCuO supercon Homogeneous coprecipitation method for preparing YBaCuO supercon

1991-02-20

1992-05-19

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

423604, 423635, 501123, 501126, 505737, 505738, C01B 1336, C01F 1102, C01F 1700, C01G 302

Patent

active

051149117

ABSTRACT:
An oxalate route coprecipitation process for preparing a superconducting YBaCuO system precursor powder comprises preparing an aqueous solution of nitrates of yttrium, barium and copper, which is then mixed with an organic solution containing a dibasic oxalate ester, an organic base and acetone. An ultrasound vibration is applied to the mixture to coprecipitate oxalates of yttrium, barium and copper. The decomposition of the oxalate ester is enhanced to an optimum rate as the result of the homogeneous phase contributed by acetone which is miscible with both water and the oxalate ester. The ultrasound vibration segregates the precipitate particles thereby preventing the coagulation of the particles and assuring fine and uniform particle size.

REFERENCES:
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patent: 4898851 (1990-02-01), Michel
patent: 5019555 (1991-05-01), Chin et al.
Pramanik "Preparation of Superconducting Ceramic Oxides by Co-Precipitation of Metal Ion Oxalates Using Triethyammonium-oxalate from mixed solvent", Reviews of Solid State Science, vol. 2, No. 2 & 3, Proceedings 1988, pp. 157-159.
Kayser "Preparation of High to YBa.sub.2 Cu.sub.3 O.sub.7-X powder from nitrate and oxalate precursors", Mat. Res. Soc. Symp. Proc., vol. 99, 1988 pp. 159-164.

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