Nanoscale secondary phase Gd2BaCuO5 "Gd-211" particles less than 60 nm in size, added to mixed ternary LREBa2Cu3Oy [LRE = (Nd0.33Eu 0.33Gd0.33), (Sm0.33Eu0.33Gd 0.33), (Nd0.33Sm0.33Gd0.33)] "NEG-123, SEG-123, NSG-123" oxide powders and melt-processed in Ar-1%pO2 gas mixture, significantly improve electromagnetic performance at low magnetic fields. As confirmed by transmission electron microscopy and dynamic force microscopy, the nanoparticles in the LRE-123 matrix not only survive the melt-texturing process but, thanks to their contamination by Zr coming from ball milling process, these particles in majority transform into a new type of even smaller defects. Further improvement in flux pinning was reached when both 123 and 211 powders were thoroughly ball milled before the melt-growth process to the similar small size. As a result, Jc values of 260 kA/cm2 and 55 kA/cm2 were observed in remnant state at 77 K and 90 K, respectively.
|ジャーナル||Physica C: Superconductivity and its applications|
|出版ステータス||Published - 2005 10月 1|
|イベント||Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity - |
継続期間: 2004 11月 23 → 2004 11月 25
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