【摘要】 研究了不同工艺条件下的Y₁Ba₂Cu₃O_7-δ陶瓷超导体的磁化率曲线k（T）,发现在Tc以下χ（T）曲线存在两个不同的跳变区:第一跳变区为超导晶粒的Meissner效应;第二跳变区来自晶粒和晶界形成超导连接后的抗磁屏蔽效应。超导相含量可以由第一跳变区的信息量进行估算。更多还原

【Abstract】 The %（T） curves of the YBa,Cu₃O_7-8 superconducting ceramics in various processes have been investigated. It has been found that there are two different diamagnetic shifts below Tc: the first is iuduced by Meissner effect of superconducting grains, and the second by the diamagnetic shielding effect of supercondcting junctions formed by grains and grain boundaries.The amount of the superconducting phase,can be estimated from the first shift.更多还原