Enhanced critical current densities in Cu-sheathed MgB2 |
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Authors: | NM Strickland RG Buckley A Otto |
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Institution: | aIndustrial Research Ltd., P.O. Box 31-310, Lower Hutt 6009, New Zealand;bAmerican Superconductor, Westborough, MA 01581, USA |
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Abstract: | Micron-scale mixing of magnesium and boron powders by mechanical alloying allows the MgB2 formation reaction to proceed as low as 450 °C, with high-quality material formed in an hour at 600 °C. At these low reaction temperatures the reaction can be performed in situ in a copper sheath, and it is found that the presence of copper enhances the superconducting properties of the MgB2. Self-field critical current densities, calculated from full critical-state simulation of magnetization hysteresis, are up to 7 × 105 A/cm2 at 13.6 K and 1 × 105 A/cm2 at 30 K. |
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Keywords: | MgB2 Mechanical alloy Critical current Critical state Copper sheath |
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