Method of preparing oxide superconductor with purified mixed metal trifluoroacetate
AssigneesKabushiki Kaisha Toshiba, International Superconductivity Technology Center, Spark Plug Co., Ltd.
InventorsTakeshi Araki, Katsuya Yamagiwa, Izumi Hirabayashi
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Abstract
An aqueous solution of mixed metal acetate including one kind or more of element selected from lanthanide series and yttrium, barium and copper is mixed with trifluoroacetic acid to prepare a solution of mixed metal trifluoroacetate. From a solution of mixed metal trifluoroacetate obtained thus, purified mixed metal trifluoroacetate of which total content of water and acetic acid is 2% by weight or less is prepared. With purified mixed metal trifluoroacetate, an oxide superconductor of excellent performance may be prepared.
Claims12
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.
Dependencies are inferred from the claim text.