Reinforcing Increase of ΔT(c) in MgB(2) 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 (T(c)) and has been confirmed in both MgB(2) and Bi(Pb)SrCaCuO systems. However, the increase of ΔT(c) (ΔT(c) = T(c) ‒ T(cpure)) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB(2) raw materials, namely, (a)MgB(2), (b)MgB(2), and (c)MgB(2), were prepared with particle sizes decreasing in order. Inhomogeneous phases, Y(2)O(3):Eu(3+) and Y(2)O(3):Eu(3+)/Ag, were also prepared and doped into MgB(2) to study the influence of doping concentration on the ΔT(c) of MgB(2) with different particle sizes. Results show that reducing the MgB(2) particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing ΔT(c). The optimal doping concentrations for (a)MgB(2), (b)MgB(2), and (c)MgB(2) are 0.5%, 0.8%, and 1.2%, respectively. The corresponding ΔT(c) values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of ΔT(c) in MgB(2) SMSCs.