High critical current density and improved irreversibility field in bulk MgB2 made by a scaleable, nanoparticle addition route
By J. Wang, Y. Bugoslavsky, A. Berenov, L. Cowey, A. Caplin, L. Cohen, J. Driscoll, L. Cooley, X. Song, D. Larbalestier. 2002
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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 ∼2×105 A cm−2 at 2 T. At 20 K, the corresponding value was ∼8×104 A cm−2. Irreversibility fields were 11.5 T at 4.2 K and 5.5 T at 20 K.
Subfields: Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/69b25c2ec65dc1515560bf22e1a4c102c23e88a0
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In Condensed Matter Physics
Citations in the corpus
- Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2003, methodology): “Thus, according to Equations (3) and ( 4 ), the slope of Hc2(T) near Tc is determined by the σ-scattering most likely is due to impurities or disorder on B sites, whereas the additional increase of Hc2 at T << Tc results from the predominantly π-scattering on Mg sites.”