| 摘要 |
PURPOSE:To obtain a superconducting material having excellent superconducting characteristics at a low cost, using a low-temperature calcination, by dispersing oxides, etc., of an alkaline-earth element and rare-earth element in an organic solvent, forming copper oxalate in the dispersion medium and filtering and calcining the product. CONSTITUTION:Oxides or carbonates (e.g. BaCO3 and Y2O3) of an alkaline-earth element (e.g. Ba) and yttrium and/or a lanthanide element are dispersed in a dispersion medium composed of an organic solvent (e.g. ethanol). The dispersion medium is added with >=1 equivalent of oxalic acid based on the copper and then with an organic solvent solution of a prescribed amount of a copper salt (e.g. copper nitrate) to form copper oxalate in the dispersion medium. The solid component or coprecipitate is separated from the dispersion medium and calcined at about 720-850%oC to obtain a superconducting material composed of oxides of an alkaline-earth metal, yttrium and/or lanthanide element and copper. |
