Influence of Cu2Se doping on the morphology, structure and synthesis reactions in MgB2 material

This study investigates the effect of Cu 2 Se doping on the morphology, structure, and reaction process of MgB 2 superconductors . Polycrystalline MgB 2 samples with different Cu 2 Se doping levels were synthesized using the conventional solid-state sintering method. A comprehensive analysis of the phase formation, microstructure, and sintering mechanisms was investigated. The results indicated that Cu 2 Se reacted with Mg at temperatures below 650 °C, forming Mg 2 Cu and MgSe phases, which leads to a reduction in the Mg content during the solid-state reaction process. This reaction pathway promotes the regeneration of the MgB 2 phase through the interaction between Mg 2 Cu and B. The novel approach not only eliminates the high porosity caused by Mg evaporation above 650 °C but also enhances the critical current density of MgB 2 by introducing secondary phase such as MgSe and MgCu 2 nanoparticles . The results suggest that Cu 2 Se doping provides a promising way for optimizing the unique microstructure and highly density of MgB 2 superconductor.