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


Citation

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

Abstract / Synopsis

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.


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Additional Metadata

Item Type: Article
Subject: Superconductors.
Subject: Nanotechnology.
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/j.physc.2010.05.076
Publisher: Elsevier
Keywords: MgB2; Carbon substitution; Upper critical field; Critical current density.
Depositing User: Najwani Amir Sariffudin
Date Deposited: 27 Jun 2012 01:48
Last Modified: 03 Nov 2015 07:34
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.physc.2010.05.076
URI: http://psasir.upm.edu.my/id/eprint/17130
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