Superconductor layer and method of manufacturing the same

Abstract

There is provided is a method of manufacturing a superconductor layer, including preparing a coating solution by dissolving trifluoroacetates of at least one metal selected from the group consisting of yttrium and lanthanoids, barium, and copper in a solvent, coating a main surface of a substrate with the coating solution to form a coating film, subjecting the coating film to a calcining process in an atmosphere containing oxygen, and subjecting the coating film after the calcining process to a firing process in an atmosphere containing water vapor at a temperature higher than that at the calcining process. The calcining process is carried out such that the coating film after the calcining process and before the firing process have an average CuO particle diameter equal to or less than 25 nm.

1 - 8 . (canceled)  
   
   
       9 . A method of manufacturing a superconductor layer, comprising: 
 preparing a coating solution by dissolving trifluoroacettes of at least one metal selected from the group consisting of yttrium and lanthanoids, barium, and copper in a solvent;    coating a main surface of a substrate with the coating solution to form a coating film;    subjecting the coating film to a calcining process in an atmosphere containing oxygen; and    subjecting the coating film after the calcining process to a firing process in an atmosphere containing water vapor at a temperature higher than that at the calcining process,    wherein the calcining process is carried out such that the coating film after the calcining process and before the firing process have an average CuO particle diameter equal to or less than 25 nm.    
   
   
       10 . A method of manufacturing a superconductor layer, comprising: 
 preparing a coating solution by dissolving trifluoroacetates of at least one metal selected from the group consisting of yttrium and lanthanoids, barium, and copper in a solvent;    coating a main surface of a substrate with the coating solution to form a coating film;    subjecting the coating film to a calcining process in an atmosphere containing oxygen; and    subjecting the coating film after the calcining process to a firing process in an atmosphere containing water vapor at a temperature higher than that at the calcining process,    wherein the calcining process includes elevating a temperature of the coating film in an atmosphere of the atmospheric pressure containing water vapor such that a maximum temperature that the coating film reaches is 400° C. or higher, and that, during the temperature elevation, a period that the temperature of the coating film is kept at 200° C. to 250° C. falls within a range of 6 hours and 15 minutes to 16 hours and 30 minutes.    
   
   
       11 . The method of manufacturing a superconductor layer according to  claim 9 , wherein the firing process is carried out in an atmosphere containing water vapor in an amount of at least 4.2% by volume.  
   
   
       12 . The method of manufacturing a superconductor layer according to  claim 10 , wherein the firing process is carried out in an atmosphere containing water vapor in an amount of at least 4.2% by volume.  
   
   
       13 . The method of manufacturing a superconductor layer according to  claim 9 , wherein the trifluoracetates used contain impurities in an amount equal to or less than 6% by mass.  
   
   
       14 . The method of manufacturing a superconductor layer according to  claim 10 , wherein the trifluoracetates used contain impurities in an amount equal to or less than 6% by mass.  
   
   
       15 . The method of manufacturing a superconductor layer according to  claim 9 , wherein the solvent contains at least one of methanol and ethanol in an amount of at least 50% by mass.  
   
   
       16 . The method of manufacturing a superconductor layer according to  claim 10 , wherein the solvent contains at least one of methanol and ethanol in an amount of at least 50% by mass.  
   
   
       17 . The method of manufacturing a superconductor layer according to  claim 9 , wherein a maximum temperature of the coating film that is reached during the firing process is 725° C. or higher.  
   
   
       18 . The method of manufacturing a superconductor layer according to  claim 10 , wherein a maximum temperature of the coating film that is reaching during the firing process is 725° C. or higher.