Alkaline oxalate precipitation process for forming metal oxide c

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k


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252518, 252521, 423263, 423593, 501152, 505801, 505802, 505807, 505815, C01F 1104, C01F 1700, C01G 302, H01L 3912




Metal oxide superconductors of the yttrium-barium-copper type (YBa.sub.2 Cu.sub.3 O.sub.4 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 (e.g., at least 11) to form a fireable precursor only partly in the form of the oxalate salts of these metals.

Cava, R. J. et al.: "Bulk Superconductivity . . . Ba.sub.2 YCu.sub.3 O.sub.9-d ", Phys. Rev. Lett., vol. 58, No. 16, pp. 408-411, Apr. 20, 1987.
Davison, S. et al.: "Chemical Problems . . . Oxides Containing Copper", ACS Symposium Series 351, pp. 65-78, Aug. 30-Sep. 4, 1987.
Grant, P. M. et al.: "Superconductivity Above 90K . . . Properties", Phys. Rev. B., 35(13), pp. 7242-7244, May 1, 1987.
Hirabayashi, M. et al.: "Structure and . . . Perovskites Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7 ", Jpn. J. Appl. Phys., 26(4), pp. L454-L455 , Apr. 20, 1987.
Kaneko, K., et al.: "On the Coprecipitation . . . System", Jpn. J. Appl. Phys., 26(5), pp. L734-L735, May 20, 1987.
Tarascon, J. M., et al.: "High Temperature . . . CuO Planes", ACS Symposium Series 351, pp. 198-210, Aug. 30-Sep. 4, 1987.
Clark, R. J., et al: "Oxalate Precipitation Methods for Preparing . . . Superconducting Compounds", in High-Temperature Superconducting Materials, ed. by W. E. Hatfield et al., published by Marcel Dekker, Inc., New York, 1988, pp. 153-158.
Inorganic Chemistry, vol. 26, No. 10, May 20, 1987, pp. 1474-1476.
"Oxalate Coprecipitation Method for Preparing the Y:Ba.sub.2 :Cu.sub.3 : O.sub.4 Superconducting Phase", by J. Leupin et al., Abstract No. 918, Symposium on High Temperature Supereconducting Materials, Sep. 18-19, 1987, Univ. of North Carolina.
Chemtech, Sep. 1987, pp. 542-551.
J. G. Bednorz et al., Z. Phys. B-Condensed Matter 64, 189-193 (1986).


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