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

Chen, Soo Kien and X, Xu and Kim, J H and Shi, Xue Dou and Driscoll, Judith (2010) The effects of C substitution and disorder on the field dependent critical current density in MgB2 with nano-SiC additions. Physica C: Superconductivity, 470 (20). pp. 1211-1215. ISSN 0921-4534

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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 insitu 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.

Item Type:Article
Keyword:MgB2; Carbon substitution; Upper critical field; Critical current density.
Subject:Superconductors.
Subject:Nanotechnology.
Faculty or Institute:Faculty of Science
Publisher:Elsevier
DOI Number:http://dx.doi.org/10.1016/j.physc.2010.05.076
Altmetrics:http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.physc.2010.05.076
ID Code:17130
Deposited By: Najwani Amir Sariffudin
Deposited On:27 Jun 2012 09:48
Last Modified:27 Jun 2012 09:48

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