Study on the Technology and Microstructural Analysis for Quasi-single Crystal Domain Melt-textured YBCO Bulk Superconductor

The paper describes the method of melt textured growth(MTG) with a top seeded technique to prepare the quasi single crystal domain YBCO bulk materials with various Y 211 particle contents. The obtained specimens have high density and good mechanical toughness. The J C of specimens reaches 1.23×10 6 A/cm 2 under 0.6 T at 30 K and 1.35×10 4 A/cm 2 under 2 T at 70 K. The SEM observation of specimens indicates that Y 211 particles can improve the quality of melt textured YBCO superconductor. Combining the microstructures with J C measurements shows that the smaller the particle size and the more homogeneous the particle distribution is, the better the pinning effectiveness is.