국부용융성장법으로 제조된 Sm이 첨가된 YBCO 초전도체의 용융온도 및 성장 속도에 따른 미세구조
Melt growth and superconducting properties of Sm-doped YBCO super-conductor by zone melting method
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Abstract
Sm-doped YBCO high Tc superconductor was directionaly grown by zone melt growth process in airatmosphere. Cylindrical green rods of (Sm/Y)1.8Ba2.4Cu3.4O7 - x[(Sm/Y)1.8] oxides were fabricated by cold isostatic pressing(CIP) method using ruber mold. Based on the variation of melting temperature and growth rate, the microstructure andsuperconducting properties were systematically measured by using optical micrographs, TEM and SQUID magnetometer. Inthis study, optimum melting temperature and growth rate were 1085oC and 3.5 mm/hr respectively. Nonsuperconducting(Sm/Y)2BaCuO5 inclusions of (Sm/Y)1.8 superconductor were uniformly distributed within the superconducting (Sm/Y)Ba2Cu3O7 - x matrix. The directionaly melt-textured (Sm/Y)1.8 superconductor showed an onset Tc 90 K and sharpsuperconducting transition.