OXIDE SUPERCONDUCTOR COMPOSITION, OXIDE SUPERCONDUCTOR WIRE, AND PRODUCTION METHOD FOR OXIDE SUPERCONDUCTOR WIRE
Provided is an oxide superconductor composition that makes it possible to increase film thickness, increase production speed, and decrease costs when producing a REBaCuO-type oxide superconductor wire (wherein RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr, and Ho). The oxide superconductor comprises, as essential components thereof, an RE salt of a carboxylic acid that serves as an RE component, that does not contain a ketone group, and that has 3-8 carbon atoms, barium trifluoroacetate that serves as a Ba component, one or more copper salts that serve as a Cu component and that are selected from the group consisting of copper salts of branched saturated aliphatic carboxylic acids having 6-16 carbon atoms and copper salts of alicyclic carboxylic acids having 6-16 carbon atoms, and an organic solvent that dissolves the aforementioned metal salt components.
1 . An oxide superconductor composition for forming an REBaCuO (where RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr and Ho)-based oxide superconductor, the oxide superconductor composition comprising, as essential components:
an RE salt of a C 3-8 arboxylic acid that is free from a ketone group and serves as an RE component;
barium trifluoroacetate that serves as a Ba component;
at least one copper salt that serves as a Cu component selected from the group consisting of copper salts of C 6-16 branched saturated aliphatic carboxylic acids and copper salts of C 6-16 alicyclic carboxylic acids; and
an organic solvent that dissolves salts of the metals.
2 . The oxide superconductor composition according to claim 1 , wherein the RE component is composed of an yttrium salt.
3 . The oxide superconductor composition according to claim 1 , wherein the RE component is composed of a propionate free from fluorine atom.
4 . The oxide superconductor composition according to claim 1 , wherein the organic solvent contains a solubilizer having an amino group.
5 . An oxide superconductive wire comprising an REBaCuO (where RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr and Ho)-based oxide superconductor, the oxide superconductor including, as essential components:
an RE salt of a C m carboxylic acid that is free from ketone group and serves as an RE component;
barium trifluoroacetate that serves as a Ba component;
at least one copper salt that serves as a Cu component selected from the group consisting of copper salts of C 6-16 branched saturated aliphatic carboxylic acids and copper salts of C 6-16 alicyclic carboxylic acids; and
an organic solvent that dissolves salts of the metals.
6 . The oxide superconductive wire according to claim 5 , wherein the RE component is composed of an yttrium salt.
7 . The oxide superconductive wire according to claim 5 , wherein the RE component is composed of a propionate free from fluorine atom.
8 . A manufacturing method of an oxide superconductive wire, the method comprising:
applying a solution of the oxide superconductor composition according to claim 1 to a surface of a tape-shaped base material by lifting the base material from a container storing the solution;
applying pre-baking treatment to the solution applied on the base material to form a precursor of an oxide superconductor on the surface of the base material; and
forming an REBaCuO (where RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr and Ho)-based oxide superconductor on the surface of the base material by applying main baking treatment to the precursor to cause crystallization.
9 . The method according to claim 8 , wherein the application of the solution of the oxide superconductor composition and the application of the pre-baking treatment are repeated one to ten times to form the precursor.