【摘要】 采用 TG-DTA 热分析和 X 射线衍射相结合的方法,研究了由不同原料制取单一相 YBa2-Cu₃O_7-（?）超导体的合成反应机理。试验结果表明,YBa2Cu₃O_7-（?）的形成经历两个反应阶段,首先形成 BaCuO₂和 Y₂Cu₂O₅,随后这两个二元复合氧化物化合形成 YBa2Cu₃O_7-（?）。各步反应温度受钡盐种类控制,采用 Ba（NO₃）₂原料,在750℃即可表现出超导性,T_c 达86K。更多还原

【Abstract】 The reaction mechanism during the synthesis of superconductorYBa₂ Cu₃ O_7-（?） has been investigated by TG-DTA thermal analysis and X-raydiffraction method.The starting materials used are carbonats,nitrades andcoprecipitation of oxalates of Y,Ba and Cu respectively.The experimentalresults show that there are two steps of the reaction for the formation of su-perconductor YBa₂ Cu₃ O_7-（?）.The binary complex oxides are firstly formed,theoxides above mentioned react each other to form the superconducting phase.The temperatures of the reaction stages depend on the species of Ba²⁺.UsingBa（NO₃）₂ as one of starting materials,the superconductivity appears at lowertemperature（about 750℃） as compared with BaCO₃ materials.更多还原