Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1988-03-03
1990-02-27
Stoll, Robert L.
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505738, 423158, 423263, 423265, 423593, 423604, 423637, 423639, 501123, 501152, 502525, 502355, 252521, C01F 1700, C01G 300
Patent
active
049046381
ABSTRACT:
A process is disclosed for producing a homogeneous mixture of co-precipitated carbonate salts capable of reacting together in an oxygen atmosphere at an elevated temperature to form a superconducting ceramic which comprises forming a first solution by dissolving in a first solvent maintained at a temperature of from about 15.degree. to 35.degree. C. a rare earth compound, an alkaline earth metal compound, and a copper compound capable of reacting with a carbonate ion to form an insoluble precipitate of carbonate salts in the solvent used to form the solution; forming a second solution containing a carbonate-forming compound dissolved in a second solvent miscible with the first solvent; blending the first and second solutions together at a temperature of from about 0.degree. to 15.degree. C. to inhibit formation of a precipitate; and heating the blended solutions to a temperature sufficient to cause the carbonate-forming compound dissolved in the second solution to decompose to form carbonate anions to thereby form a carbonate precipitate comprising a homogeneous mixture of the carbonate salts of the rare earth, alkaline earth metal, and copper compounds dissolved in the first solution.
REFERENCES:
Skoog et al.; Fundementals of Analytical Chemistry Holt, Reinhart and Winston Inc., N.Y., 1963, pp. 188-191.
Voight et al., "A Hydroxycarbonate Route to Superconductor Precursor Powders", Materials Research Society Symposium Proceedings, vol. 99, Nov. 30-Dec. 4, 1987, Massachusetts, pp. 635-638.
Fujiki et al., "Preparation of High--Tc Y--Ba--Cu--O Superconductor Using Collodial Methods", Japanese Journal of Applied Physics, vol. 26, No. 7, Jul. 1977, pp. L1159-L1160.
Ginley et al., "Grain Boundary Superconductivity in the YBaCuO System", Materials Research Society Proceedings of Symposiums, Spring 1987, pp. 201-204.
Communications in Organic Chemistry, vol. 26, No. 10, 1987, Comparison of Carbonate, Citrate and Oxalate Chemical Routes to the High--Tc Metal Oxide Superconductors La.sub.z-x Sr.sub.x CuO.sub.4.
M. L. Salutsky et al., "The Rare Earth Metals and Their Compounds, XII. Carbonates of Lanthanum, Neodymium and Samarium", Journal of the American Chemical Society, vol. 72, Jul. 1950, pp. 3306-3307.
Earl L. Head et al., "The Preparation and Thermal Decomposition of the Carbonates of Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, and Sc", Proceedings of the Fourth Conference on Rare Earth Research, Apr. 22-25, 1964, pp. 707-718.
Harvey Paige C.
Hewlett--Packard Company
Stoll Robert L.
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