Abstract
Abstract Large melt-textured NdBa 2 Cu 3 O y crystals with a sharp superconducting transition have been fabricated in air with Nd 2 BaO 4 addition. Experiments show that NdBa 2 Cu 3 O y and Nd 4 Ba 2 Cu 2 O y are present in melt-textured crystals which grow in the centre of cylindrical samples while NdBa 4 Cu 3 O y , as a stable phase, instead of the NdBa 6 Cu 3 O y phase, which has been reported previously, has been observed in the residual liquid phase located in the edge of samples. In comparison with the effects of Nd 4 Ba 2 Cu 2 O y addition, the refined Nd422 particles can be obtained in the present composition. The influence of the short-time thermal treatment in Ar before oxygenation has been discussed. Fabricated bulk samples exhibit onset T c values of 95 K and the secondary peak effect in the M – H loop. The peak values of J c are 2.4×10 4 A/cm 2 in 0 T at 77 K and 2×10 4 A/cm 2 in 1.3 T at 77 K.
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