Vajpayee, Arpita and Jha, R. and Srivastava, A. K. and Kishan, H. and Tropeano, M. and Ferdeghini, C. and Awana, V. P. S. (2011) The effect of synthesis temperature on the superconducting properties of n-SiC added bulk MgB2 superconductor. Superconductor Science and Technology , 24 (4). 045013-1-045013-11. ISSN 0953-2048

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Abstract

We study the effect of synthesis temperature on the phase formation in nano(n)-SiC added bulk MgB2 superconductor. In particular we study: lattice parameters, amount of carbon (C) substitution, microstructure, critical temperature (Tc), irreversibility field (Hirr), critical current density (Jc), upper critical field (Hc2) and flux pinning. Samples of MgB2 + (n-SiC)x with x = 0.0, 0.05 and 0.10 were prepared at four different synthesis temperatures, i.e. 850, 800, 750 and 700 °C with the same heating rate and holding time of 10 °C min − 1 and 2.5 h, respectively. We found 750 °C to be the optimal synthesis temperature for n-SiC doping in bulk MgB2 in order to get the best superconducting performance in terms of Jc, Hc2 and Hirr. Carbon substitution enhances the Hc2 while the low temperature synthesis is responsible for the improvement in Jc due to the smaller grain size, defects and nano-inclusion induced by incorporation of C into the MgB2 matrix, which is corroborated by HRTEM (high-resolution transmission electron microscopy) results.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Institute of Physics.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	12 Oct 2012 11:27
Last Modified:	12 Oct 2012 11:27
URI:	http://npl.csircentral.net/id/eprint/684

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