YBa₂Cu₃Oxの超伝導特性におよぼすReO₃添加の影響

抄録

To examine the effect of rhenium oxide addition on the superconducting properties of YBCO ceramics, Y₁Ba₂Cu₃Re_xO_y (YBCO) specimens with x=0 to 0.1 were prepared by both conventional sintering and melt-growth methods. It has been found that the addition of ReO₃ has significant effects on the critical temperature and critical current density of YBCO superconductors. By addition of Re_0.01, the critical temperatures of the sintered and meltgrown specimens were increased to 89.5K and 91.9K, respectively. The maximum critical current densities of the sintered and melt-grown specimens were 396A/cm² (Re_0.01), and 753A/cm² (Re_0.005), respectively. XMA and XRD analyses showed that some Re ion was incorporated in the YBCO crystal.