Significant improvement of Jc in MgB2 bulk superconductor using ball-milled high-purity crystalline boron

被引：20
|
作者：
Zhang, Y. [1 ]
Xu, X. [1 ]
Zhao, Y. [1 ]
Kim, J. H. [1 ]
Lu, C. [2 ]
Zhou, S. H. [1 ]
Dou, S. X. [1 ]
机构：
[1] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
[2] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2008年 / 21卷 / 11期
基金：
澳大利亚研究理事会;
关键词：
D O I：
10.1088/0953-2048/21/11/115004
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The particle size, purity and form of the starting boron powders play an important role in the superconducting properties of MgB(2). In this paper high-purity (99.999%) boron powders with crystalline phase that were processed by ball milling have been used as the precursor powders. It was observed that the critical current density (J(c)) valuewas 9.1 x 10(3) A cm(-2) at 5 K and 8 T, which is two times higher than for a sample with ball-milled amorphous boron powders, and a factor of 40 higher than a sample made from as-supplied amorphous boron powders. Significant J(c) improvement at high fields is attributed to the H(c2) enhancement caused by the increased disorder.
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页数：6
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