Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-02-10
1990-05-08
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423263, 423593, 423604, 423635, 501123, 501152, 505815, C01F 1104, C01F 1700, C01G 302, H01L 3912
Patent
active
049238493
ABSTRACT:
Metal oxide superconductors of the yttrium-barium-copper type can be formed by precipitation from an aqueous solution of the salts of the metals using an oxalate precipitation reagent under basic pH conditions to form a fireable precursor only partly in the form of the oxalate salts of these metals.
REFERENCES:
Cava, R. J. et al., "Bulk Superconductivity . . . Ba.sub.2 Y Cu.sub.3 O.sub.9--d, " Phys. Rev. Lett. vol. 58, No. 16 p. 1676-1678, Apr. 20, 1987.
Hirabayashi, M et al.: "Structure and . . . Perovskite Y, Ba.sub.2 Cu.sub.3 O.sub.7 " Jpn. Jnl. Appl. Phys. vol. 26, No. 4, pp. L454-L455, Apr. 1987.
Clark, R. et al.: "Oxalate Precipitation Methods for Preparing the Yttrium-Barium-Copper Superconducting Compound" High-Temperature Superconducting Materials, Ed. by W. E. Hatfield et al., published by Marcel Dekker, Inc., New York, 1988 p. 153-158.
Leupin, J. et al.: "Oxalate Coprecipitation Method for preparing the Y:Ba.sub.2 : Cu.sub.3 : Ox Superconducting Phase" Abstract No. 918 Symposium on High Temp. Superconducting Materials, Sep. 18-19, 1987, Univ. of North Carolina.
Akzo America Inc.
Boyd John E.
Fennelly Richard P.
Lieberman Paul
Morris Louis A.
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