Abstract
A large bulk YBCO superconductor was prepared by the modified Quench and Melt Growth (QMG) process. The process included the enlargement precursor and unidirectional growth. Single-grained bulk as large as 45mm in diameter and 15mm thick was obtained by this technique. The single grained bulk material exhibited a strong repulsion force in relation to a permanent magnet and a strong attraction force after field cooling. These phenomena were explained by the resistance to the magnetic flux movement in the superconductor. Avoiding grain boundary proved to be effective in preparing the high performance bulk superconductor. The critical current density (Jc) was improved by optimizing the QMG process. The starting composition was effective and Jc increased to 3.7 × 104 A/cm2 at 1T and 77K when 50 mol% of excess Y2BaCuO5 was added.
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