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High critical current density and improved irreversibility field in bulk MgB2 made by a scaleable, nanoparticle addition route

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10 Author(s)
Wang, J. ; Centre for High Temperature Superconductivity, Imperial College, Prince Consort Road, London SW7 2AZ, United Kingdom ; Bugoslavsky, Y. ; Berenov, A. ; Cowey, L.
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Bulk samples of MgB2 were prepared with 5, 10, and 15 wt % Y2O3 nanoparticles, added using a simple solid-state reaction route. Transmission electron microscopy showed a fine nanostructure consisting of ∼3–5 nm YB4 nanoparticles embedded within MgB2 grains of ∼400 nm size. Compared to an undoped control sample, an improvement in the in-field critical current density JC was observed, most notably for 10% doping. At 4.2 K, the lower bound JC value was ∼2×105A cm-2 at 2 T. At 20 K, the corresponding value was ∼8×104A cm-2. Irreversibility fields were 11.5 T at 4.2 K and 5.5 T at 20 K. © 2002 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:81 ,  Issue: 11 )

Date of Publication:

Sep 2002

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