Enhancement of JC-B Properties in MoSi2 doped MgB2 tapes

TL;DR

This study demonstrates that doping MgB2 tapes with MoSi2 significantly enhances their critical current density and magnetic field performance, with optimal doping at 2.5 at.% due to improved grain linkage and flux pinning.

Contribution

It introduces a doping method using MoSi2 to improve MgB2 tape performance, identifying optimal doping levels for maximum JC enhancement.

Findings

Maximum JC increase of over 4 times at 2.5 at.% doping

Improved magnetic field dependence of JC in doped tapes

Enhanced flux pinning centers due to MoSi2 doping

Abstract

MoSi2 doped MgB2 tapes with different doping levels were prepared through the in-situ powder-in-tube method using Fe as the sheath material. Effect of MoSi2 doping on the MgB2/Fe tapes was investigated. It is found that the highest JC value was achieved in the 2.5 at.% doped samples, more than a factor of 4 higher compared to the undoped tapes at 4.2 K, 10 T, then further increasing the doping ratio caused a reduction of JC. Moreover, all doped tapes exhibited improved magnetic field dependence of Jc. The enhancement of JC-B properties in MoSi2 doped MgB2 tapes is attributed to good grain linkage and the introduction of effective flux pining centers with the doping.