Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1987-11-16
1989-08-22
ALbrecht, Dennis
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
252518, 252521, 423263, 423419P, 423429, 423430, 423593, 423604, 423635, 423637, 423639, 501123, 501126, 501152, 505809, 505810, C01F 1118, C01F 1700, C04B 3550, H01L 3912
Patent
active
048596523
ABSTRACT:
Superior homogeneity in ceramic materials is achieved by forming an aqueous solution of trichloroacetates of certain metals, heating the solution to decompose the trichloroacetates to form carbonate precipitates, and recovering the carbonate precipitates. The latter can be calcined to form superconductors. For example, oxides, or carbonates of Y, Ba, and Cu are dissolved in aqueous trichloroacetic acid and the solution is heated to decompose trichloroacetate ions and to form mixed carbonates, which precipitate. The precipitate is recovered and calcined to form a superconducting material.
REFERENCES:
Rice, C. E., et al.: Appl. Phys Lett, 51 ( ), Nov. 30, 1987, pp. 1842-1844.
Johnson, S. M., et al.: Advanced Ceramic Materials, Vol. 2, No. 3B, Special Issue, Jul. 1987, pp. 337-342.
Salutsky, M. L. and Quill, L. L., J. Am. Chem. Soc., 72, 3306-3307 (1950).
Quill, L. L. and Salutsky, M. L., Anal. Chem., 24, 1453 (1952).
Wu et al, Superconductivity at 93K in a New Mixed Phase Y-Ba-Cu-O compound System at Ambient Pressure, Physical Review Letters, 58, 908-910 (1987).
Engler et al, Superconductivity above Liquid Nitrogen Temperature: Preparation and Properties of a Family of Perovskite-Based Superconductors, J. Am. Chem. Soc. 109, 2848-2849 (1987).
Wang et al, Comparison of Carboanate, Citrate, and Oxalate Chemical Routes to the High-T.sub.c Metal Oxide Superconductors La.sub.2-x Sr.sub.x CuO.sub.4, Inorg. Chem. 26, 1474-1476 (1987).
Albrecht Dennis
McDowell, Jr. William W.
W. R. Grace & Co.,-Conn.
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