Patent ID: 6586042
Filing Date: 2003-07-01
Classification: H01L,Y10T

Abstract:
A method for preparing an oxide superconductor, comprising:mixing an aqueous solution of mixed metal acetate containing barium, copper, and one kind or more metal element selected from the group consisting of lanthanide and yttrium with trifluoroacetic acid to prepare an aqueous solution of mixed metal trifluoroacetate; distilling the aqueous solution of mixed metal trifluoroacetate under a reduced pressure to prepare a first purified mixed metal trifluoroacetate in which water and acetic acid are reduced; adding a first monohydric alcohol to the first purified mixed metal trifluoroacetate to prepare a monohydric alcohol solution of mixed metal trifluoroacetate; distilling the monohydric alcohol solution of mixed metal trifluoroacetate under a reduced pressure to prepare a second purified mixed metal trifluoroacetate in which a total content of water and acetic acid is two % by weight or less; dissolving the second purified mixed metal trifluoroacetate in a second monohydric alcohol to prepare a coating solution; coating the coating solution on a base material to prepare a film of mixed metal trifluoroacetate; and heating the film of the mixed metal trifluoroacetate to prepare a superconductor.