【摘要】 本工作采用 BaO₂为原料制备 YBa₂Cu₃O_7-δ超导体材料,采用固相反应合成工艺和普通烧成条件,所得的超导体具有下列特性:（1）单相性好。由 X 射线衍射分析为单纯的正交相;（2）含碳量低,所得的 YBa₂-Cu₃O_7-δ陶瓷其含碳量比以 BaC₂O₄为原料的 YBa₂Cu₃O_7-δ陶瓷低一半;（3）YBa₂Cu₃O_7-δ陶瓷的烧结温度比较低,致密度高,密度可达理论值的90%以上,显气孔率只有5.78%;（4）采用相同的制备工艺,所得YBa₂Cu₃O_7-δ陶瓷的电流密度比以 BaC₂O₄为原料的 YBa₂Cu₃O_7-δ陶瓷提高3倍左右。更多还原

【Abstract】 The relationship between raw materials,processing microstructure and physicalproperties for YBa₂Cu₃O_7-δ ceramics was investigated.Two kinds of Ba-containedmaterials were used as raw mateials,one w（?）s BaO₂ and the other was BaC₂O₄.TheYBa₂Cu₃O_7-δ ceramics were prepared by the solid state reaction method.Physicalproperties,such as sintering shrinkage,density,transition temperature and criticalcurrent ect were measured.The microstructures of these two kinds of YBa₂Cu₃O_7-δceramics were characterized by SEM and optical mic（?）oscope.A singlephase materialwith orthorhombic structure was obtained for this YBCO ceramics prepared withBaO₂.The carbon content of this YBCO material is low and the relative density isabout 90%.The critical current of this YBCO ceramics is higher than that of YBCOprepared with BaC₂O₄.It seems likely that high-quality,single-phase YBa₂Cu₃O_7-δceramic samples with orthorhombic structure could be made by using BaO₂ as rawmatcrial and solid state reaction processing.更多还原