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

被引：0

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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