Phase transformation and superconducting properties of MgB2 using ball-milled low purity boron

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作者：
Xu, X. [1 ]
Kim, J.H. [1 ]
Hossain, M.S.A. [1 ]
Park, J.S. [1 ]
Zhao, Y. [1 ]
Dou, S.X. [1 ]
Yeoh, W.K. [2 ]
Rindfleisch, M. [3 ]
Tomsic, M. [3 ]
机构：
[1] Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
[2] IRC in Superconductivity, Department of Engineering, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom
[3] Hyper Tech Research, Inc., 1275 Kinnear Road, Columbus, OH 43212, United States
来源：
Journal of Applied Physics | 2008年 / 103卷 / 02期
关键词：
MgB2 samples were prepared by using 96% boron (B) powder with strong crystalline phase that had been ball milled for various times. We observed samples that contained ball-milled 96% B in comparison with one made from as-supplied commercial 96% B; with the results showing a significant enhancement in the high field critical current density (Jc) due to small grain size and better reactivity. Specifically; many grain boundaries for MgB2 could be acting as strong flux pinning centers. Based on Rowell connectivity analysis; when the ball-milling time increased; the connectivity factor; described as the active cross-sectional area fraction (AF); was decreased. This implies that the intergrain connectivity became worse. These properties could lead to poor Jc in low field. However; the pinning force strength; Jc; 1/2; ×; B1/4; of samples using ball-milled 96% B is larger than that of the reference sample using commercial 96% B powder. These results accompany enhanced irreversibility (Hirr) and upper critical fields (Hc2). © 2008 American Institute of Physics;
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