Abstract
Effects of a combined substitute of Yb and Nd on Y site on the superconducting properties of YBa 2Cu 3O y have been studied. We synthesized Y 1− x (Yb 0.9Nd 0.1) x Ba 2Cu 3O z compound with x = 0.2, 0.4, 0.6, 0.8 and 1.0. Here, the ratio of Yb–Nd was fixed to be 9:1 for obtaining 123 phase without secondary phases. The melt processing thermal profiles for Y 1− x (Yb 0.9Nd 0.1) x Ba 2Cu 3O z with x = 0.2 and 0.4 and the addition of 40 mol% {Y 1− x (Yb 0.9Nd 0.1) x } 2BaCuO 5 and 0.5 wt% Pt in air were determined on the basis of the thermal analysis results. All samples showed a low grain growth rate, particularly for high x values, which may be partially ascribed to un-optimized thermal schedules. Although almost all the samples exhibited low J c values, the sample with x = 0.2 exhibited T c of 88.8 K and a relatively high J c value of 16,000 A/cm 2 at 77 K for H//c-axis.
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