21-05-2020 дата публикации
Номер: US20200156955A1
A process for producing a process for producing a LnMCuOhigh-temperature superconductive powder, the process comprising: 1. A process for producing a LnMCuOhigh-temperature superconductive powder , the process comprising:i) providing an aqueous solution of Ln, M and Cu and at least one mineral acid;ii) adding at least one sequestrating agent and, optionally, at least one dispersant to the solution to form a precipitate;iii) recovering the precipitate from the solution; and{'sub': 2', '3', 'x, 'iv) heating the precipitate in a flow of oxygen to form the LnMCuOpowder,'}wherein Ln is a rare earth element, preferably Y, Ce, Dy, Er, Gd, La, Nd, Pr, Sm, Sc, Yb, or a mixture of two or more thereof, andwherein M is selected from Ca, Sr, and Ba.2. A process for producing a LnMXCuOand/or LnMXCuOhigh-temperature superconductive powder , the process comprising:i) providing an aqueous solution of Ln, M, X and Cu and at least one mineral acid;ii) adding at least one sequestrating agent and, optionally, at least one dispersant to the solution to form a precipitate;iii) recovering the precipitate from the solution; and{'sub': 2-y', 'y', '3', 'x', '2', '2-y', 'y', 'x, 'iv) heating the precipitate in a flow of oxygen to form the LnMXCuOand/or LnMXCuOpowder,'}wherein X is selected from the group consisting of Mg, Se, Sr, Ca and mixtures of two or more thereof,wherein Ln is a rare earth element, preferably Y, Ce, Dy, Er, Gd, La, Nd, Pr, Sm, Sc, Yb, or a mixture of two or more thereof, andwherein M is selected from Ca, Sr, and Ba.3. The process according to claim 2 , wherein X is Mg.4. The process according to claim 2 , wherein the powder has a morphology selected from the group consisting of cigars claim 2 , spiral claim 2 , spires claim 2 , rods claim 2 , tubes claim 2 , cylinders claim 2 , agglomerates and flat “cracker” shaped crystalline agglomerates.5. The process according to claim 4 , wherein the process further comprises:v) sintering the powder at a temperature of from 930° C. ...
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