Processing of GdBa2Cu3O7-y bulk superconductor and its trapped magnetic field

被引：40

作者：

Nariki, S ^{[1
]}

Sakai, N ^{[1
]}

Murakami, M ^{[1
]}

机构：

[1] ISTEC, Superconduct Res Lab, Minato Ku, Tokyo 1050023, Japan

来源：

PHYSICA C | 2001年 / 357卷 / SUPPL. 2期

关键词：

melt processing; trapped magnetic field; critical current density; Gd-Ba-Cu-O;

D O I：

10.1016/S0921-4534(01)00352-5

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Large c-axis oriented GdBa2Cu3O7-y (Gd-123) bulk superconductors, which contain Gd2BaCuO5 (Gd-211) secondary phase and Ag, were melt textured under controlled oxygen partial pressure of 1.0%. Nd-123 was used as a seed crystal for the growth of large-grain bulk. Single-domain Gd-123 samples 32 mm in diameter were successfully fabricated with no macro-sized cracks. The employment of fine starting Gd-211 powders led to a reduction in the mean diameter of Gd-211 particles dispersed in the bulk, which resulted in an improvement in both J(c) and field-trapping capability. The trapped magnetic field of the bulk Gd-Ba-Cu-O/Ag made from Gd-211 particles 0.8 mum in diameter reached 1.5 T at 77 K. Furthermore, the trapped magnetic field could be improved by the enlargement of bulk diameter and the optimization of Gd-211 content. The maximum trapped field of 2.0 T at 77 K was achieved for the Gd-Ba-Cu-O/Ag bulk sample 48 mm in diameter with the composition of Gd-123:Gd-211 = 10:5. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：629 / 634

页数：6

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