The effects of sintering temperature on superconductivity in MgB2/Fe wires

We studied the effects of sintering temperature on the phase transformation, lattice parameters, full width at half-maximum (FWHM), strain, critical temperature (Tc), critical current density (Jc) and resistivity (rho) in MgB2/Fe wires. All samples were fabricated by the in situ powder-in-tube metho...

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Bibliographic Details
Published in:Superconductor science & technology 2007-05, Vol.20 (5), p.448-451
Main Authors: Kim, J H, Dou, S X, Wang, J L, Shi, D Q, Xu, X, Hossain, M S A, Yeoh, W K, Choi, S, Kiyoshi, T
Format: Article
Language:English
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Summary:We studied the effects of sintering temperature on the phase transformation, lattice parameters, full width at half-maximum (FWHM), strain, critical temperature (Tc), critical current density (Jc) and resistivity (rho) in MgB2/Fe wires. All samples were fabricated by the in situ powder-in-tube method (PIT) and sintered within a temperature range of 650-900 deg C. It was observed that wires sintered at low temperature, 650 deg C, resulted in higher Jc up to 12 T and lower Tc. The best transport Jc value reached 4200 A cm-2 at 4.2 K and 10 T. This is related to the grain boundary pinning due to small grain size. On the other hand, wires sintered at 900 deg C had a lower Jc in combination with a higher Tc.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/20/5/007