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The effect of synthesis temperature on the superconducting properties of n-SiC added bulk MgB 2 superconductor

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 MgB 2 superconductor. Superconductor Science and Technology, 24 (4). 045013.

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Official URL: http://stacks.iop.org/0953-2048/24/i=4/a=045013

Abstract

We study the effect of synthesis temperature on the phase formation in nano(n)-SiC added bulk MgB 2 superconductor. In particular we study: lattice parameters, amount of carbon (C) substitution, microstructure, critical temperature ( T c ), irreversibility field ( H irr ), critical current density ( J c ), upper critical field ( H c2 ) and flux pinning. Samples of MgB 2 + (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 MgB 2 in order to get the best superconducting performance in terms of J c , H c2 and H irr . Carbon substitution enhances the H c2 while the low temperature synthesis is responsible for the improvement in J c due to the smaller grain size, defects and nano-inclusion induced by incorporation of C into the MgB 2 matrix, which is corroborated by HRTEM (high-resolution transmission electron microscopy) results.

Item Type:Article
ID Code:11157
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:24
Last Modified:02 Nov 2011 00:47

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