Crystal growth and pinning enhancement of directionally melt-textured (Y0.5Nd0.25Sm0.25)Ba2Cu3Oyoxides in air
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Abstract
High Tc (Y0.5Nd0.25Sm0.25)Ba2Cu3Oy [(YNS)-123] superconductors with/without CeO2 additive were systematically investigated by the zone melt growth process in air. Cylindrical green rods of (YNS)-123 oxides were fabricated by cold isostatic pressing (CIP) method using rubber mould. A sample prepared by this method showed well-textured microstructure, and (Y0.5Nd0.25Sm0.25)2BaCuO5 [(YNS)211] nonsuperconducting inclusions were uniformly dispersed in large (Y0.5Nd0.25Sm0.25)Ba2Cu3Oy [(YNS)123] superconducting matrix. In this study, optimum melting temperature and growth rate were 1100oC and 3 mm/hr, respectively. The directionally melt-textured (YNS)-123 sample with CeO2 additive showed an onset critical temperature (Tc) Tc ≥ 93 K and sharp superconducting transition.
참고문헌 (10)
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