Abstract
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 (Tc) and has been confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of ΔTc (ΔTc = Tc ‒ Tcpure) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB2 raw materials, namely, aMgB2, bMgB2, and cMgB2, were prepared with particle sizes decreasing in order. Inhomogeneous phases, Y2O3:Eu3+ and Y2O3:Eu3+/Ag, were also prepared and doped into MgB2 to study the influence of doping concentration on the ΔTc of MgB2 with different particle sizes. Results show that reducing the MgB2 particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing ΔTc. The optimal doping concentrations for aMgB2, bMgB2, and cMgB2 are 0.5%, 0.8%, and 1.2%, respectively. The corresponding ΔTc values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of ΔTc in MgB2 SMSCs.
Highlights
Three types of MgB2 raw materials, namely, a MgB2, b MgB2, and c MgB2, were prepared with particle sizes decreasing in order
The effectiveness of improving the Tc of superconducting materials through the smart meta-superconductor (SMSC) method by doping with EL inhomogeneous phases has been proven in previous works, the ∆Tcs obtained are quite small
To further increase ∆Tc, three types of MgB2 raw materials, namely, a MgB2, b MgB2, and c MgB2, were prepared with particle sizes decreasing in order
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The effectiveness of improving the Tc of superconducting materials through the SMSC method by doping with EL inhomogeneous phases has been proven, but the ∆Tc (∆Tc = Tc − Tcpure ) values obtained are generally small (0.2–0.4 K). Our group has increased the Tc of smart meta-superconductor Bi(Pb)SrCaCuO by adjusting the content of inhomogeneous phase [42], implying that the Tc of MgB2 SMSC can be further improved through the similar method. 0.4 K, 0.9 K, and 1.2 K, which exhibit significant improvements compared with the ∆Tcs (0.2–0.4 K) in previous work [36,37,38,39,40] Such an improvement of Tc is a novel property given that all the experiments before our work confirmed that doping a second phase decreased the Tc of MgB2.
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