| 摘要 |
PURPOSE:To suppress lowering of critical electric current density by application of a magnetic field by adding a specific amount of Os to a mixture consisting of oxides of Bi, Sr, Ca and Cu and then calcining the mixture. CONSTITUTION:Raw material powder of Bi2O3, SrCO3, CaCO3, and CuO, etc., is weighted and mixed in moist state using a ball mill and then dried to prepare mixed powder having prescribed weight ratio. Then Os powder is blended with the mixed powder so as to become 0.1-2wt.% based on total composition and ethyl acetate, etc., is added thereto and these components are mixed in moisten state and dried and then molded under pressure. Then the melding is heated and burned at about 800-900 deg.C in the atmosphere to provide an oxide superconductor hardly lowering critical electric current density by application of magnetic field. |
