Transport and structural properties of MgB<sub>2</sub>/Fe wires produced by redesigning internal Mg diffusion process
Hakan Yetiş, Doğan Avcı, Fırat Karaboğa, Canan Aksoy, Daniel Gajda, Elena Martínez, Fatih Mehmet Tanyıldızı, A. Zaleski, Michał Babij, Lan Maria Tran, L.A. Angurel, Germán F. de la Fuente, İ. Belenli
Abstract
Abstract We report transport, electromechanical, and structural properties of single core MgB 2 /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 MgB 2 structure in the center and a dense circular MgB 2 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 MgB 2 structure shared the applied current and indirectly behaved as an internal stabilizer against quench damage at high applied currents.