Effect of Ultra-sonicated Y2BaCuO5 on Top-Seeded Melt Growth YBa2Cu3Oy Bulk Superconductor

Abstract

In this work, we tried to improve the superconducting performance of bulk YBa 2 Cu 3 O y (Y123) superconductors via Y 2 Ba 1 Cu 1 O 5 (Y211) secondary phase refinement. A novel method of ultra-sonication was used to refine the Y211 secondary phase particles. The Y211 powder was treated by ultra-sonication for 0 to 80 min with steps of 20 min, keeping the power (300 W) and frequency (20 kHz) constant. For synthesis of the YBCO bulk, we employed top-seeded melt growth (TSMG) with Pt addition. Magnetization measurements showed a superconducting transition temperature at around 91 K, irrespective of ultrasonication parameters. Interestingly, critical current density and trapped field were found to be proportional to the ultra-sonication duration. YBCO bulk sample (20 mm diameter, 7 mm in thickness) fabricated for 80 min ultra-sonicated Y211 showed a maximum trapped field of 0.42 T at 77 K, 0.3 mm above the top surface. The improved trapped field values are explained on the basis of improvements in the microstructure. Keywords YBa 2 Cu 3 O y. Y 2 BaCuO 5. Top-seeded melt growth. Ultra-sonication. Critical current density

The effect of pre-sintering and high-temperature infiltration on the properties of single-domain YBCO bulk superconductors by the Y + 011 top-seeded infiltration growth process

“…It can be observed that the trapped field distributions of the samples are conical in shape with only one peak value around the center, meaning that all samples also have singledomain magnetism. The largest trapped field of the singledomain YBCO bulk is about 0.41 T, which is clearly larger than the values reported by the other authors [37][38][39]43], as shown in table 1.…”