Superconducting properties of the melt-growth bulk GdBa2Cu 3O7-δ (Gd123) were studied with the addition of BaO2, fine Gd2BaCuO5 (Gd211) and Gd 2Ba4MoCuOz (Gd2411) from the viewpoint of improvement of the critical current density (Jc) by growth process in air. The addition of BaO2 with 0.1 in a molar ratio to Gd123 effectively enhanced Jc. This is coming from the suppression of the solid solution growth in Gd123 with Ba-rich phase. The addition of the ball-milled fine Gd211 particles enhanced Jc to 90,000 A/cm 2 at 77 K under self-field. Single phase Gd2411 was successfully synthesized in air and added into Gd123 system with substitution in part by Gd211 as the second phase. The Jc of the samples mixed with Gd2411 reached 84,500 A/cm2 at 77 K under self-field. We conclude that the present additive materials with a proper amount are very effective to improve the Jc value of Gd123 bulk superconducting magnets.
|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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