Light carbon doping by oxygen-free paraffin wax to enhance the current density of MgB2 in the entire field regime
An oxygen-free hydrocarbon, paraffin wax, was evenly doped into MgB2 by a new method to enhance the electromagnetic properties. A 5 wt% paraffin addition resulted in significant enhancements of the upper critical field (Hc2), irreversible critical field (Hirr), and critical current density (Jc) properties in the entire field range at both 5 and 20 K. This excellent low-field and high-temperature Jc performance may be ascribed to the small carbon substitution, high critical temperature (Tc) and non-degraded grain coupling in the optimum paraffin-doped MgB2 sample.
Jiang, C., Dou, S. X., Cheng, Z. & Wang, X. (2008). Light carbon doping by oxygen-free paraffin wax to enhance the current density of MgB2 in the entire field regime. Superconductor Science and Technology, 21 (6), 065017-1-065017-4.