Preparing method of oxide superconductor, raw material for oxide superconductor, and preparing method of raw material for oxide superconductor
AssigneesKabushiki Kaisha Toshiba, International Superconductivity Technology Center, Spark Plug Co., Ltd.
InventorsTakeshi Araki, Katsuya Yamagiwa, Izumi Hirabayashi
Life of this patent
Estimating the term…
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.
Claims15
A method for preparing an oxide superconductor, comprising:
- mixing an aqueous solution of mixed metal acetate containing one kind or more metal element selected from lanthanide series and yttrium, barium and copper with trifluoroacetic acid to prepare an aqueous solution of mixed metal trifluoroacetate;
- purifying the aqueous solution of mixed metal trifluoroacetate prepared according to the mixing to prepare purified mixed metal trifluoroacetate in which a total content of water and acetic acid is two % by weight or less;
- dissolving the mixed metal trifluoroacetate prepared according to the purifying in a solvent to prepare a coating solution;
- coating the coating solution prepared according to the dissolving on a base material to prepare a film of mixed metal trifluoroacetate;
- and
- heating the base material thereon the film of the mixed metal trifluoroacetate is formed according to the coating to prepare a superconductor.
Raw material for an oxide superconductor, comprising:
- mixed metal trifluoroacetate of one kind or more of metal selected from lanthanide series and yttrium, barium and copper:
- wherein a total content of water and acetic acid is 0.5% by weight or less with respect to mixed metal trifluoroacetate.
A method for preparing raw material for an oxide superconductor, comprising:
- mixing an aqueous solution of metal acetate containing one kind or more of metal element selected from lanthanide series elements and yttrium, barium and copper with trifluoroacetic acid to prepare a solution of metal trifluoroacetate;
- a first refining process in which the solution of metal trifluoroacetate prepared according to the mixing is refined under a reduced pressure to prepare a first purified metal trifluoroacetate in which water and acetic acid are reduced;
- adding a substance capable of replacing the water and acetic acid in the first purified metal trifluoroacetate to the first purified metal trifluoroacetate prepared according to the first refining process;
- and
- a second refining process where the first purified metal trifluoroacetate, to which the replaceable substance is added according to the addition, is refined under a reduced pressure to prepare a second purified metal trifluoroacetate in which a total content of water and acetic acid is 2% by weight or less.
Dependencies are inferred from the claim text.