Doping effect of Zr and Ti on the critical current density of MgB2 bulk superconductors prepared under ambient pressure

被引：41
作者：
Zhao, Y
Feng, Y
Huang, DX
Machi, T
Cheng, CH
Nakao, K
Chikumoto, N
Fudamoto, Y
Koshizuka, N
Murakami, M
机构：
[1] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan
[2] Univ New S Wales, Sch Mat Sci & Engn, Superconduct Res Grp, Sydney, NSW 2052, Australia
[3] NW Inst Nonferrous Met Res, Xian 710016, Peoples R China
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2002年 / 378卷
关键词：
critical currents; metals; alloys and binary compounds; flux pinning;
D O I：
10.1016/S0921-4534(02)01395-3
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The doping effect of Ti and Zr on the superconducting properties and the microstructure of sintered MgB2 bulk materials has been studied. The transition metal is found to work as a sintering assistant, which significantly enhances the grain connection of the MgB2 bulk materials during sintering processing. With this technique, we have fabricated Ti-doped MgB2 bulk materials consisting of fine 10 nm scale particles and achieved a high J(c) over 1 MA/cm(2) in 0 T at 20 K. The large enhancement of J(c) is explained by the excellent connection between grains and a high density of pinning centers served by grain boundaries and MgO nanoparticles. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码：122 / 126
页数：5
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