(YNdSm)-Ba-Cu-O system high Tc composite superconductors were directionally grown by zone melting process, having large temperature gradient, in air atmosphere. Cylindrical green rods of (YNdSm)1.8Ba2.4Cu3.4Ox [(YNS)1.8]composite oxides by CIP (cold isostatic pressing) method using rubber mold were fabricated. Themicrostructure and superconducting properties were investigated by XRD, TEM and SQUID magnetometer. The size of nonsuperconducting (YNdSm)2BaCuO5 inclusions of the melt-textured (YNS)1.8 sample with CeO2 additive were remarkably reduced and uniformly distributed within the superconducting (YNS)1.8 matrix. (YNS)1.8 samples, with / without CeO2 additive, showed an onset Tc ≥ 90 K and sharp superconducting transition. The critical current density Jc value of the (YNdSm)1.8 superconductor with CeO2 additive were 840 A, 1.2×104 A/cm2 in 77 K, 0Tesla by direct current transport method.
