| 摘要 |
PURPOSE:To obtain the titled powder with fine, uniform size, capable of giving high-temperature superconducting ceramics with large critical current density, by blending a flux with a mixture of a rare earth metal compound, alkaline earth metal compound and copper compound followed by provisional sintering. CONSTITUTION:The objective rare earth metal-alkaline earth metal-copper oxide type superconducting ceramic raw powder having oxygen-defect type laminar perovskite structure can be obtained by blending a flux with a mixture of a rare earth metal compound, alkaline earth metal compound and copper compound followed by provisional sintering at pref. 700-1,000(csp. 750-950) deg.C. If the provisional sintering temperature is lower than 700 deg.C, the formation of oxygen-defect type perovskite structure will be delayed, whereas said temperature of >1,000 deg.C is unfavorable because of fusion of the particles during their provisional sintering or the sublimation of the flux. |
