Physics – Condensed Matter – Superconductivity
Scientific paper
2002-03-22
Supercond. Sci. Technol. 15 (2002) 1043
Physics
Condensed Matter
Superconductivity
10 pages, 5 figures. Submitted to Supercond. Sci. Technol
Scientific paper
10.1088/0953-2048/15/7/309
Superconducting Ag or Cu sheathed MgB2 wires have been fabricated by conventional powder-in-tube techniques. The in-situ reaction of Mg and B powders with atomic proportions of 1:2 and 1.33:2 inside Ag or Cu tubes at low temperatures have been searched. An active alloying of Mg with Ag or Cu sheaths at temperatures below 660 C has been observed. For Ag sheaths, there is a strong diffusion of Mg, which does not allow the formation of large amounts of MgB2 at the core. For Cu sheaths, the diffusion of Mg is stopped by the formation of a MgCu2 layer around the superconducting core and an appropriated excess of Mg leads to superconducting cores with Tc=39 K and good Jc values, thus being possible the development of Cu/MgB2 composite wires.
Angurel L. A.
Martinez Eduardo
Navarro Rafael
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