Experimental study demonstrates kilometer-length 30-filament magnesium diboride wires with high critical current density, indicating great potential for low-temperature superconducting magnets.
MgB2is one of the practical superconductors that has been widely studied over the past two decades. The internal magnesium diffusion (IMD) method serves as a promising method because it can enhance the grain connectivity of MgB2phase and thereby improve the superconducting current of MgB2wires. Here, we present the fabrication of 30-filament MgB2 wires using the IMD method. The wires have a diameter of 1.00 mm and length more than 1 km. The filling factor of MgB2is around 10% and the superconducting currentIc(4.2K, 3T) reaches 650 A. The highest layer-superconducting current densityJe(4.2K, 3T) is 8.9×103 A mm-2 and engineering superconducting current densityJe(4.2K, 3T) is 8.3×102 A mm-2. Meanwhile, the percentage of copper in the MgB2wire is 28% and the residual resistivity ratio RRR(300K/40K) is 60. This can enhance the thermal stability for the low-temperature application. All of these indicate the great potential for the application of our MgB2wires in the future.
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Xie et al. (2025) studied this question.
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