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High critical current densities in Cu-sheathed MgB2 formed from a mechanically-alloyed precursor

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3 Author(s)
Strickland, N.M. ; Industrial Research Ltd, PO Box 31-310, Lower Hutt, New Zealand ; Buckley, R.G. ; Otto, A.

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Mechanical alloying is used to produce a metallic precursor for MgB2 formation. Micron-scale mixing of magnesium and boron powders allows the MgB2 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 7×105A/cm2 at 13.6 K and 1×105A/cm2 at 30 K, in zero applied field. © 2003 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:83 ,  Issue: 2 )

Date of Publication:

Jul 2003

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