Abstract
We fabricated lauric acid (LA) doped MgB2 wires and investigated the effects of the LA doping. For the fabrication of the LA-doped MgB2 wires, B powder was mixed with LA at 0–5wt.% of the total amount of MgB2 using an organic solvent, dried, and then the LA-treated B and Mg powders were mixed stoichiometrically. The powder mixture was loaded into an Fe tube and the assemblage was drawn and sintered at 900°C for 3h under an argon atmosphere.We observed that the LA doping induced the substitution of C for the B sites in MgB2 and that the actual content of C increased monotonically with increasing LA doping level. The LA-doped MgB2 wires exhibited a lower critical temperature (Tc), but better critical current density (Jc) behavior in a high magnetic field: the 5wt.% LA-doped sample had a Jc value of 5.32×103A/cm2, which was 2.17 times higher than that of the pristine sample (2.45×103A/cm2) at 5K and 6T, suggesting that LA is an effective C dopant in MgB2 for enhancing the high-field Jc performance.
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