Akademik Veri Yönetim Sistemi
Journal of Alloys and Compounds, cilt.1053, 2026 (SCI-Expanded, Scopus)
Magnesium diboride (MgB2) with its critical temperature of 39 K and binary composition has been an attractive potential superconductor to substitute industrial conventional superconductors like NbTi and Nb3Sn. On the other hand, further studies are still needed to increase in field critical current density (Jc) and improve the mechanical properties of MgB2 wires. Our work focuses on Internal Magnesium Diffusion (IMD) processed MgB2 wires, prepared using 4 % carbon doped nano-boron powders and pure Mg rods as well as 200 nm Cu-coated Mg rods of nominal diameters 0.6 mm, 0.8 mm, and 1.1 mm. The sintering process was conducted at 600 °C, 650 °C, and 700 °C for 5 h. Scanning Electron Microscopy (SEM) and Electron Probe Micro-Analyzer (EPMA) results show an enhancement in inter-granular properties with denser and more homogeneous formation of MgB2. DTA analysis revealed that Cu coating decreases the activation energy and lowers the onset temperature of the exothermic reaction peak associated with boosting MgB2 formation by about 2 °C. Resistance-Temperature (R-T) measurements show that samples sintered at 600 °C generally exhibit better superconducting performance under high magnetic fields. Transport Jc measurements at 4.2 K and 10 T indicated the highest values obtained, with 3.34 × 104 A/cm2 for the 0.8 mm pure Mg rod wire and 3.18 × 104 A/cm2 for the 1.1 mm Cu-coated Mg rod wire, both sintered at 600 °C for 5 h. The results indicate that a very small amount of Cu coating on the Mg rod can reduce the sintering temperature in addition to increasing the reaction kinetics of MgB2 without degrading the Jc of the wires.