| 摘要 |
The invention comprises superconducting materials comprising metal borides of chemical formula Mg1-xXxB2, where 0<x<=0.5 and X is Ca, Be, Al, Li, Zn, Cu, Ni, Cr, Ti, Zr, Gd or any combination thereof, which exhibit superconductivity at temperatures exceeding 30K. The invention includes superconducting wires made from Mg1-xXxB2 where 0<=x<=0.5 which may be made using the "powder-in-tube" method whereby precursor powders for Mg1-xXxB2 are inserted into a metallic tube, which may then be subjected to a series of mechanical and thermal treatments to densify and react the boride superconductor and thereby provide superconducting wire. The boride precursor may be separated from the metal of the tube using an inert spacer material such as boron nitride. Such wires may be rebundled one or more times to provide a multifilamentary superconducting wire.
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