Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SiC doping
By Shixue Dou, S. Soltanian, J. Horvat, X. Wang, P. Munroe, S. Zhou, M. Ionescu, H. Liu, M. T. Isem, University of Wollongong and 3 more. 2002
832 citations recorded by the source corpus.
Doping of MgB2 by nano-SiC and its potential for the improvement of flux pinning were studied for MgB2−x(SiC)x/2 with x=0, 0.2, and 0.3 and for 10 wt % nano-SiC-doped MgB2 samples. Cosubstitution of B by Si and C counterbalanced the effects of single-element doping, decreasing Tc by only 1.5 K, introducing intragrain pinning centers effective at high fields and temperatures, and significantly enhancing Jc and Hirr. Compared to the undoped sample, Jc for the 10 wt % doped sample increased by a factor of 32 at 5 K and 8 T, 42 at 20 K and 5 T, and 14 at 30 K and 2 T. At 20 K and 2 T, the Jc for the doped sample was 2.4×105 A/cm2, which is comparable to Jc values for the best Ag/Bi-2223 tapes. At 20 K and 4 T, Jc was twice as high as for the best MgB2 thin films and an order of magnitude higher than for the best Fe/MgB2 tapes. The magnetic Jc is consistent with the transport Jc which remains at 20 000 A/cm2 even at 10 T and 5 K for the doped sample, an order of magnitude higher than the undoped one. Because o...
Subfields: Biomedical Engineering, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/1d3da293f0abf5204d9e5a31cfb6f25667d530f1
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In Biomedical Engineering
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Citations in the corpus
- Two-band superconductor magnesium diboride (2008, methodology): “A particularly successful technique for achieving high Hc2, Hirr and Jc(H) values in bulk samples is doping with SiC nanoparticles [46].”