Abstract
(Sm/Y)-Ba-Cu-O system high Tc composite superconductors with/without <TEX>$CeO_2$</TEX> additive were directionally grown by zone-melting process, haying large temperature gradient, In air atmosphere. Cylindrical green rods of <TEX>$({Sm/y})_{1.8}Ba_{2.4}Cu_{3.4}O_x$</TEX> [(Sm/Y)1.8] composite oxides by cold isostatic pressing(CIP) method using rubber mold were fabricated. The microstructure and superconducting properties were investigated by XRD, SEM, TEM and SQUID magnetometer. The size of nonsuperconducting <TEX>$({Sm/y})_2BaCuO_5$</TEX> inclusions of the melt-textured (Sm/Y)1.8 sample with CeO<TEX>$_2$</TEX> additive were remarkably reduced and uniformly distributed within the superconducting (Sm/Y)1.8 matrix. Both samples, with/without <TEX>$CeO_2$</TEX> additive, showed an onset Tc <TEX>$\geq$</TEX> 90 K and sharp superconducting transition. The critical current density Jc value of the <TEX>$CeO_2$</TEX> addictive were <TEX>$1{\times}10^5A/\textrm{cm}^2$</TEX> in 77 K, 0 Tesla.
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