Preparation and enhancement of critical current density in MgB2 wires and tapes

Y. Feng, G. Yan, Y. Zhao, C. F. Liu, P. X. Zhang, L. Zhou, A. Sulpice, E. Mossang, B. Hebral

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摘要

We have successfully prepared monofilamentary MgB2 wires and tapes with different sheathed metals such as Cu, Ta/Cu and Fe by the powder-in-tube method. The phase composition, superconducting properties and microstructure features are investigated by x-ray diffractometer, the standard four-probe technique, SQUID magnetometer, SEM and TEM. The results indicate that Jc in MgB2/Ta/Cu wires is higher than 105 A cm-2 at 5 K in 0.1 T and 104 A cm-2 at 20 K in 1 T. By Ti-doping, Jc can be significantly improved. MgB2/Fe wires show very high transport critical current densities of 1.43 × 105 A cm-2 (4.2 K, 4 T), 3.72 × 104 A cm-2 (15 K, 4 T) and 2.34 × 104 A cm-2 (25 K, 3 T). Also the results indicated that small grain size should respond to the large Jc in Ti-doped MgB2 tape and MgB2/Fe wire.

源语言英语
页(从-至)1803-1811
页数9
期刊Journal of Physics Condensed Matter
16
10
DOI
出版状态已出版 - 17 3月 2004
已对外发布

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