Critical current density performance of malic acid doped magnesium diboride wires at different operating temperatures

Authors

X Xu, University of WollongongFollow
Jung Ho Kim, University of WollongongFollow
Yun Zhang, University of WollongongFollow
M Jercinovic, University of Zagreb, Croatia
E Babic, University of Zagreb, Croatia

RIS ID

31464

Publication Details

Xu, X., Kim, J., Zhang, Y., Jercinovic, M. & Babic, E. (2009). Critical current denisty performance of malic acid doped magnesium diboride wires at different operating temperatures. International Journal of Modern Physics B, 23 (17), 3497-3502.

Abstract

We investigated the effects of different operating temperatures on the performance of transport critical current density, J_c, for MgB₂ + 10 wt%C₄H₆O₅MgB₂/Fe wires. It was shown that the J_c values of the malic acid doped wires sintered at 900°C reached 10⁴ Acm^-2 at 20 K and 5 T. The J_c value extrapolated to 2 T and 20 K exceeds the practical level of 10⁵ Acm^-2. According to the Kramer plots, the pinning force, F_K = J_c^1/2 x B^1/4, is expected to be a linear function of magnetic field B. The irreversibility field, B_irr, at which extrapolated F_K reaches zero, was 1.8 T at 32.8 K, 2.8 T at 30 K, 5.7 T at 25 K, 8.6 T at 20 K, and 12.5 T at 15 K, respectively.