This study reports a new method to prepare Y-Ba-Cu-O (YBCO) bulk superconductors with high critical current density (Jc). With the addition of 1 mol% Y2Ba4CuAgOy (Y24Ag1) nanoparticles, the Jc at 77 K of YBCO bulk is ̃ 5.8 × 104 A cm-2, while that of the sample without the addition is ̃ 1.5 × 104 A cm-2, which reflects about 4 times the enhancement. The above Y24Ag1 nano-particles were prepared by a sol-gel process of mixing metal nitrate with a polyacrylic acid (PAA) solution as precursors, followed by heating at 1000 °C for 3 h. X-ray diffraction (XRD) analysis indicated that the Y24Ag1 precursor particles are well crystallized with an average cluster size of 0.67 μm. In the as-grown single grain melt-textured sample, Y24Ag1 nano particles with the size of 10-20 nm were found to be homogeneously distributed in the YBa2Cu 3O7-δ (Y123) matrix. On the other hand, the Y 2BaCuO5 (Y211) remained micro-sized, which was not changed by the addition of Y24Ag1 nano particles.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering