Oxide superconductor, manufacturing method therefor, and base substrate therefor

Abstract

An oxide superconductor of the present invention characterized in that it comprises: a substrate 1 made of metals having a high melting temperature; at least one oxide intermediate layer 2 and 3 which is formed on at least one surface of the substrate 1 ; and a thick film oxide superconductor layer 5 which is formed on the oxide intermediate layer 2 and 3 by the liquid phase epitaxial method in which the substrate 1 provided with the oxide intermediate layer 2 and 3 is put into a solution 7 containing the elements comprising an oxide superconductor layer, and is then pulled out from the solution 7.

1 : An oxide superconductor comprising: 
 a substrate made of metals having a high melting temperature;    at least one oxide intermediate layer which is formed on at least one surface of said substrate; and    a thick film oxide superconductor layer which is formed on said oxide intermediate layer by the liquid phase epitaxial method in which said substrate provided with said oxide intermediate layer is put into a solution containing the elements comprising said oxide superconductor layer, and is then pulled out from said solution.    
     
     
         2 : An oxide superconductor according to  claim 1 , wherein said oxide intermediate layer comprises a first intermediate layer formed at said substrate side and a second intermediate layer formed at said oxide superconductor layer side; said first intermediate layer is made of materials having a low reactivity to said substrate and said second intermediate layer; said second intermediate layer is made of materials having a low reactivity to said intermediate layer and said solution; and said thick film oxide superconductor layer is prepared by being grown by said liquid phase epitaxial method from a seed layer for the superconductor oxides which is formed on said second intermediate layer.  
     
     
         3 : An oxide superconductor according to  claim 2 , wherein said substrate is made of an Ni alloy or a Zr alloy; said first intermediate layer is made of oxides containing a metal selected from the group consisting of Ni, Mg, Ba, and Zr; and said second intermediate layer is made of oxides containing Ba.  
     
     
         4 : An oxide superconductor according to  claim 1 , said oxide superconductor comprises a substrate which is made of an Ni alloy having a high melting temperature; a first intermediate layer which is made of MgO and is formed on said substrate; a second intermediate layer which is made of BaZrO 3  and is formed on said first intermediate layer; and an oxide superconductor layer which has a composition represented by the general formula REBaCuO wherein RE denotes at least one element selected from the group consisting of Y, Nd, Sm, Eu, Er, Dy, Gd, Ho, Tm, and Yb.  
     
     
         5 : A base substrate for an oxide superconductor comprising: 
 a substrate which is made of metals having a high melting temperature;    a first intermediate layer which is formed on said substrate; and    a second intermediate layer which is formed on said first intermediate layer,    wherein said substrate is made of metals having a high melting temperature; said first intermediate layer is made of oxides which have a low reactivity to the elements comprising said substrate and said second intermediate layer; and said second intermediate layer is made of oxides which have a low reactivity to the elements comprising said first intermediate layer, a heat resistance which is higher than that of said first intermediate layer, and a low reactivity to a solution of the superconductor oxides.    
     
     
         6 : A manufacturing method for an oxide superconductor comprising the steps of: 
 forming at least one main oxide intermediate layer and a seed layer for an oxide superconductor layer on at least one surface of a substrate made of metals having a high melting temperature;    carrying out the liquid phase epitaxial method in which said substrate provided with said main oxide intermediate layer and said seed layer is put into a solution containing the elements comprising said oxide superconductor layer and is then pulled up from said solution, thereby a raw oxide superconductor layer is formed on said main oxide intermediate layer by growing said seed layer; and    heat treating said raw oxide superconductor layer, and thereby said raw oxide superconductor layer is converted into an oxide superconductor layer.    
     
     
         7 : A manufacturing method according to  claim 6 , wherein said main oxide intermediate layer comprises a first intermediate layer which is formed on said substrate side and a second intermediate layer which is formed on said raw oxide superconductor layer side; said first intermediate layer is made of materials which have a low reactivity to said substrate and said second intermediate layer; and said second intermediate layer is made of materials which have a low reactivity to said solution.  
     
     
         8 : A manufacturing method according to  claim 7 , wherein said substrate is made of an Ni alloy or a Zr alloy; said first intermediate layer is made of oxides containing a metal selected from the group consisting of Ni, Mg, Ba, and Zr; and said second intermediate layer is made of oxides containing Ba.  
     
     
         9 : A manufacturing method according to  claim 6 , wherein said substrate is made of an Ni alloy which has a high melting temperature; said first intermediate layer is made of MgO; said second intermediate layer is made of BaZrO 3 ; and said oxide superconductor layer has a composition represented by the general formula REBaCuO, wherein RE denotes at least one element selected from the group consisting of Y, Nd, Sm, Eu, Er, Dy, Gd, Ho, Tm, and Yb.  
     
     
         10 - 17  (cancelled)