Transport and structural properties of MgB2/Fe wires produced by redesigning internal Mg diffusion process

We report transport, electromechanical, and structural properties of single core MgB2/Fe wire produced using a new fabrication method, called designed internal Mg diffusion (IMD) process, which relies on the use of non-stoichiometric Mg + B pellets with excess Mg in place of a central Mg rod used in the standard IMD method. Structural analysis revealed the successful formation of a porous MgB2 structure in the center and a dense circular MgB2 layer surrounding this structure in the designed-IMD wire. Fast transport I-V measurements showed that the designed IMD method increased engineering critical current density (J (e)) up to twice that of the IMD wires in self-field. The central porous MgB2 structure shared the applied current and indirectly behaved as an internal stabilizer against quench damage at high applied currents.

Automated summary

We report the transport, electromechanical, and structural properties of single core MgB2/Fe wire produced using a new fabrication method called designed internal Mg diffusion (IMD) process. This method involves the use of non-stoichiometric Mg + B pellets instead of a central Mg rod in the standard IMD method. The results show that the designed IMD method significantly increases the engineering critical current density (J(e)), and the central porous MgB2 structure acts as an internal stabilizer against quench damage at high applied currents.