The target of an unmanned space experiment is the fabrication of large grain Gd-Ba-Cu-O superconductors 12 cm in diameter in microgravity environment. The advantage of the space experiment is the support of a huge sample by a seed crystal alone. For this experiment, the cold seeding (CS) method must be employed to meet the requirements of the space program. Although the CS method is easy to apply, it has been difficult to grow large grain samples because of a small temperature window for a stable crystal growth. We thus studied the heat schedules for the space experiment using a prototype ground experiment furnace, which is similar to the furnaces launched into space. We could find the melt growth conditions that enabled us to successfully grow Gd-Ba-Cu-O bulk superconductors 10 cm in diameter even by the CS method.
|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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