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

Authors

Yun Zhang, University of WollongongFollow
Xun Xu, University of WollongongFollow
Yue Zhao, University of WollongongFollow
Jung Ho Kim, University of WollongongFollow
Cheng Lu, University of WollongongFollow
Sihai Zhou, University of WollongongFollow
S. X. Dou, University of WollongongFollow

RIS ID

24537

Publication Details

Zhang, Y., Xu, X., Zhao, Y., Kim, J., Lu, C., Zhou, S. & Dou, S. (2008). Significant improvement of Jc in MgB2 bulk superconductor using ball-milled high-purity crystalline boron. Superconductor Science and Technology, 21 (11), 115004-(6pages).

Abstract

The particle size, purity and form of the starting boron powders play an important role in the superconducting properties of MgB2. 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 (Jc) value was 9.1 x 103 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 Jc improvement at high fields is attributed to the Hc2 enhancement caused by the increased disorder.

Grant Number

ARC/DP0770205

Additional Grant Number

http://purl.org/au-research/grants/ARC/DP0770205