The critical current density of advanced internal-Mg-diffusion-processed MgB2 wires
| Autor: | Li, G. Z., Sumption, M. D., Susner, M. A., Yang, Y., Reddy, K. M., Rindfleisch, M. A., Tomsic, M. J., Thong, C. J., Collings, E. W. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | published in Supercond. Sci. Technol. 25 (2012) 115023 (8pp) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-2048/25/11/115023 |
| Popis: | Recent advances in MgB2 conductors are leading to a new level of performance. Based on the use of proper powders, proper chemistry, and an architecture which incorporates internal Mg diffusion (IMD), a dense MgB2 structure with not only a high critical current density Jc, but also a high engineering critical current density, Je, can be obtained. In this paper, a series of these advanced (or second - generation, "2G") conductors has been prepared. Scanning electron microscopy and associated energy dispersive X-ray spectroscopy were applied to characterize the microstructures and compositions of the wires, and a dense MgB2 layer structure was observed. The best layer Jc for our sample is 1.07x105 A/cm2 at 10 T, 4.2 K, and our best Je is seen to be 1.67x104 A/cm2 at 10 T, 4.2 K. Optimization of the transport properties of these advanced wires is discussed in terms of B-powder choice, area fraction, and the MgB2 layer growth mechanism. Comment: 13 pages, 3 tables, 7 figures (or 8 pp in published version) |
| Databáze: | arXiv |
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