Influence of Y2BaCuO5 Particles Distribution in Melt-textured Y-Ba-Cu-O Bulk Superconductor on the Superconducting Properties
Y2BaCuO5粒子在准单畴Y-Ba-Cu-O超导块材中的分布及其对超导性能的影响

Single-domain Y-Ba-Cu-O(YBCO) high temperature superconductor bulk was fabricated by top-seeding melt texture growth process. The distribution of Y2BaCuO5 (Y211) particles and its effect on the critical current density (Jc) and levitation force of the bulk samples were investigated. Scan electron microscope (SEM) analysis showed that the distribution of the Y211 particles presented an inhomogeneous character throughout the YBCO matrix. The experimental result also showed that the critical current density and levitation force were in inverse proportion to the mean radius of the Y211 particles. The smaller the diameter of the Y211 particles and the more uniform the distribution of the Y211 particles were, the larger the value of Jc and the levitation force were. For the sample of single-domain YBCO bulk with 20mm in diameter, the levitation force could reach 33N (77K,0.55T) and the magnitude of Jc could reach 6.6×104A/cm2.