Utilization of novel materials, particularly high-T_c (critical temperature) superconductors, is essential to pursue the United Nations’ Sustainable Goals, as well as to meet the increasing worldwide demand for clean and carbon-free electric power technologies. Superconducting magnets are beneficial in several real-life applications including transportation, energy production, magnetic resonance imaging (MRI), and drug delivery systems. To achieve high performance, one must develop uniform, large-grain, infiltration-growth (IG) processed bulk YBa₂Cu₃O_y (Y-123) super-magnets. In this study, we report the magnetic and microstructural properties of a large-grain, top-seeded, IG-processed Y-123 pellet, which is 20 mm in diameter and 6 mm in height; the pellet is produced utilizing liquid Yb-123+Ba₃Cu₅O₈ as the liquid source. All the samples cut from the top of the bulk exhibit a sharp superconducting transition (approximately 1 K wide) with the onset T_c of approximately 90 K. However, in the samples cut from the bottom surface, the onset T_c values slightly decreased to between 88 and 90 K, although still exhibiting a sharp superconducting transition. The top and bottom samples exhibited the highest remnant value of J_c (critical current density) at 77 K H//c-axis of 50 and 55 kA/cm², respectively. The remnant J_c and irreversibility field values significantly fluctuated, being fairly low in some bottom samples. Scanning electron microscopy identified nanometer size Y-211 (Y₂BaCuO₅) secondary-phase particles dispersed in the Y-123 matrix. Energy-dispersive spectroscopy clarified that the decreased both T_c and J_c for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.

使用新型材料，特别是高T _c（临界温度）超导体，对于实现联合国的可持续目标以及满足全球对清洁和无碳电力技术日益增长的需求至关重要。超导磁体在多种现实应用中大有裨益，包括运输、能源生产、磁共振成像 (MRI) 和药物输送系统。为了实现高性能，必须开发均匀、大颗粒、渗透-生长 (IG) 处理的大块 YBa ₂ Cu ₃ O _y(Y-123) 超级磁铁。在这项研究中，我们报告了大颗粒、顶部种子、IG 处理的 Y-123 颗粒的磁性和微观结构特性，其直径为 20 毫米，高度为 6 毫米；以液态Yb-123+Ba ₃ Cu ₅ O ₈为液源生产球团矿。从主体顶部切割的所有样品都表现出急剧的超导转变（约 1 K 宽），起始T _c约为 90 K。然而，在从底部表面切割的样品中，起始T _c值略微降低至在 88 到 90 K 之间，尽管仍然表现出急剧的超导转变。顶部和底部样本显示出最高的J残余值_c（临界电流密度）在 77 K H//c轴分别为 50 和 55 kA/cm ²。残余J _c和不可逆场值显着波动，在一些底部样品中相当低。扫描电子显微镜识别出纳米尺寸的 Y-211 (Y ₂ BaCuO ₅ ) 二次相颗粒分散在 Y-123 基质中。能量色散光谱表明底部样品的T _c和J _c降低归因于 Y-123 相内的液相分散。