Abstract
(Sm/Y)<TEX>$_{1.8}$</TEX>B <TEX>$a_{2.4}$</TEX>C <TEX>$u_{3.4}$</TEX><TEX>$O_{7-x}$</TEX> [(Sm/Y)1.8] high <TEX>$T_{c}$</TEX> superconductors were directionally grown by Rod-type Seed Melt Growth(RSMG) process in air atmosphere. The sintered polycrystalline N <TEX>$d_{1.8}$</TEX>B <TEX>$a_{2.4}$</TEX>C <TEX>$u_{3.4}$</TEX><TEX>$O_{7-x}$</TEX>(Nd1.8) of rod-type seed crystal grown by extrusion mold process were used for achieving the ab-plane alignment haying large grains perpendicular to the center of (Sm/Y)1.8 samples. The observations using TEM micrographs of the melt-textured (Sm/Y)1.8 samples revealed that the nonsuperconducting (Sm/Y)211 inclusions are uniformly distributed in the superconducting (Sm/Y)123 matrix. The microstructure and superconducting properties were investigated by XRD, TEM and SQUID magnetometer. The RSMG (Sm/Y)1.8 samples showed an onset <TEX>$T_{c}$</TEX> <TEX>$\geq$</TEX> 90 K and sharp superconducting transition.nsition.ion.nsition.
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More From: Journal of the Korean Institute of Electrical and Electronic Material Engineers
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