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Optimizing C incorporation into magnesium diboride.


Citation

Soo, Kien Chen and Kwee, Y. Tan and Kar, Ban Tan and Shaari, Abdul Halim and Kursumovic, Ahmed and MacManus-Driscoll, Judith L. (2011) Optimizing C incorporation into magnesium diboride. IEEE Transactions on Applied Superconductivity, 21 (3). pp. 2627-2630. ISSN 1051-8223

Abstract

In this work, either SiC or separate Si and C (Si+C) powders of up to 10 weight percentage were in situ reacted with Mg and B (molar ratio of 1:2) and the superconducting properties compared. The latter shows a smaller a-axis lattice cell parameter as compared to the same level of SiC additions, indicating a higher level of C substitution. In those samples, a larger increase in the C-axis is also noticeable and a more severe degradation in the superconducting transition temperature is observed. However, reaction with SiC causes a greater broadening in the transition width. At both 5Kand 20 K, for samples reacted with SiC (up to 5 wt.%) a stronger improvement in the magnitude of critical current density, J c, is obtained. On the other hand, samples reacted with (Si+C) show a weaker dependence on field at 5 K because of higher C substitution. At 20 K, the decreases more rapidly with field for the same level of SiC additions. Hence, for high temperature (20 K) and lowfield (<5 T) applications, reaction with SiC is preferred for obtaining higher J c (H).


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1109/TASC.2010.2089420
Publisher: Institute of Electrical and Electronics Engineers
Keywords: Carbon substitution; Critical current density; Lattice parameters.
Depositing User: Nur Farahin Ramli
Date Deposited: 19 Sep 2013 03:39
Last Modified: 19 Sep 2013 03:39
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1109/TASC.2010.2089420
URI: http://psasir.upm.edu.my/id/eprint/24636
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