The effects of C substitution and disorder on the field dependent critical current density in MgB2 with nano-SiC additions

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Abstract

In this work, nano sized SiC powders were mixed with Mg and B and reacted by either a one-step in situ or two-step method resulted in different level of C substitution. X-ray diffraction shows the presence of Mg2Si signifying that the reaction between SiC and Mg occurred leading to the release of C in samples reacted in one-step method. Moreover, the much reduced value of a-axis indicates C substitution took place. Resistivity measurements showed higher intragrain scattering owing to a higher density of defects and/or impurities. These samples also show higher Hirr and Hc2 at 20 K in comparison to samples with mainly unreacted SiC (hence lower C substitution). More importantly, their Jc's are more insensitive to high magnetic field (>4 T) at 6 K. However, at 20 K the effect of C content on Jc(H) is less pronounced. Finally, the order of magnitude of Jc(H) at both 6 K and 20 K is rather dominated by pinning. © 2010 Elsevier B.V. All rights reserved.

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Chen, S. K., Xu, X., Kim, J. H., Dou, S. X., & Macmanus-Driscoll, J. L. (2010). The effects of C substitution and disorder on the field dependent critical current density in MgB2 with nano-SiC additions. In Physica C: Superconductivity and its Applications (Vol. 470, pp. 1211–1215). Elsevier B.V. https://doi.org/10.1016/j.physc.2010.05.076

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