High critical current densities in Cu-sheathed MgB[sub 2] formed from a mechanically-alloyed precursor

Strickland, N. M.; Buckley, R. G.; Otto, A.
July 2003
Applied Physics Letters;7/14/2003, Vol. 83 Issue 2, p326
Academic Journal
Mechanical alloying is used to produce a metallic precursor for MgB[SUB2] formation. Micron-scale mixing of magnesium and boron powders allows the MgB[SUB2] formation reaction to proceed at as low as 450 °C, with high-quality material formed in an hour at 600 °C. These low reaction temperatures allow the reaction to be performed in situ in a copper sheath. Critical current densities, calculated from a full critical-state simulation of magnetization hysteresis loops, are up to 7×10[SUP5] A/cm[SUP2] at 13.6 K and 1×10[SUP5] A/cm[SUP2] at 30 K, in zero applied field.


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