Reinforcing Increase of in MgB Smart Meta-Superconductors by Adjusting the Concentration of Inhomogeneous Phases.

Incorporating with inhomogeneous phases with high electroluminescence (EL) intensity to prepare smart meta-superconductors (SMSCs) is an effective method for increasing the superconducting transition temperature () and has been confirmed in both MgB and Bi(Pb)SrCaCuO systems. However, the increase of ( = ‒ ) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB raw materials, namely, MgB, MgB, and MgB, were prepared with particle sizes decreasing in order. Inhomogeneous phases, YO:Eu and YO:Eu/Ag, were also prepared and doped into MgB to study the influence of doping concentration on the of MgB with different particle sizes. Results show that reducing the MgB particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing . The optimal doping concentrations for MgB, MgB, and MgB are 0.5%, 0.8%, and 1.2%, respectively. The corresponding values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of in MgB SMSCs.