Rare earth oxide superconductor and process for producing the same

A rare earth oxide superconductor comprising a metal substrate;

• an intermediate layer formed on the surface of the metal substrate by sequentially disposing a first intermediate layer comprising cerium and a solid solution formation element capable of forming a solid solution with cerium, and a second intermediate layer comprising cerium, the solid solution formation element and a charge compensation element capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element;
• and a rare earth oxide superconductive layer formed on the intermediate layer.

A rare earth oxide superconductor comprising a metal substrate;

• an intermediate layer formed on the surface of the metal substrate, comprising cerium, a solid solution formation element capable of forming a solid solution with cerium, and a charge compensation element capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element;
• and a rare earth oxide superconductive layer formed on the intermediate layer.

A method for producing a rare earth oxide superconductor comprising the steps of applying a mixed solution, on the surface of a metal substrate, comprising an organometallic acid salt of cerium and an organometallic acid salt of any 1 type or 2 types or more of solid solution formation elements capable of forming a solid solution with cerium selected from (Y, Nd, Sm, Gd, Eu, Yb, Ho, Tm, Dy, La and Er) and then preliminarily calcining the same to form a first coated layer;

• applying a mixed solution, on the first coated layer, comprising an organometallic acid salt of cerium and an organometallic acid salt of any of 1 type or 2 types or more of a charge compensation element capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element selected from (Bi, Nb, Sb, Ta and V) to form a second coated layer followed by carrying our a heat treatment in a reducing atmosphere under a pressure ranging from 0.1 Pa to below atmospheric pressure and a temperature ranging from 900 to 1200° C. to form an intermediate layer;
• and then forming a rare earth oxide superconductive layer on the intermediate layer.

A method for producing a rare earth oxide superconductor comprising the steps of applying a mixed solution, on the surface of a metal substrate, comprising an organometallic acid salt of cerium and an organometallic acid salt of any of 1 type or 2 types or more of a solid solution formation element capable of forming a solid solution with cerium selected from (Y, Nd, Sm, Gd, Eu, Yb, Ho, Tm, Dy, La and Er) and preliminarily calcining the same to form a first coated layer;

• applying a mixed solution, on the first coated layer, comprising an organometallic acid salt of cerium, an organometallic acid salt of 1 type or 2 types or more of the solid solution formation element, and an organometallic acid salt of 1 type or 2 types or more of the charge compensation element capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element selected from (Bi, Nb, Sb, Ta and V) to form a second coated layer followed by carrying out heat treatment in a reducing atmosphere under a pressure ranging from 0.1 Pa to below atmospheric pressure and a temperature ranging from 900 to 1200° C. to form an intermediate layer;
• and then forming a rare earth oxide superconductive layer on the intermediate layer.

A method for producing a rare earth oxide superconductor comprising the steps of applying a mixed solution, on the surface of a metal substrate, comprising an organometallic acid salt of cerium, an organometallic acid salt of any of 1 type or 2 types or more of a solid solution formation element capable of forming a solid solution with cerium selected from (Y, Nd, Sm, Gd, Eu, Yb, Ho, Tm, Dy, La and Er), and an organometallic acid salt of any of 1 type or 2 types or more of a charge compensation element capable of compensating for a charge mismatch attributable to a difference between the electron valences of respective ions of cerium and the solid solution formation element selected from (Bi, Nb, Sb, Ta and V) followed by carrying out heat treatment in a reducing atmosphere under a pressure ranging from 0.1 Pa to below atmospheric pressure and a temperature ranging from 900 to 1200° C. to form an intermediate layer;

• and then forming a rare earth oxide superconductive layer on the intermediate layer.