调节非均匀相浓度强化MgB2智能亚超导体ΔTC的提高
Reinforcing increase of ΔTC in MgB2 smart meta-superconductors by adjusting the concentration of inhomogeneous phases
摘要：
采用具有高电致发光（EL）强度的非均匀相掺杂制备智能亚超导体（SMSCs）是提高超导转变温度（Tc）的有效方法，并已在MgB_2和Bi（Pb）SrCaCuO体系中得到证实。然而，由于不均匀相的最佳浓度较低，ΔTc的增加相当小。在这项工作中，三种MgB 2原料，即，aMgB 2，bMgB 2，和cMgB 2，制备的颗粒尺寸依次减小。制备了Y2 O3：Eu 3+和Y2 O3：Eu 3 +/Ag非均匀相，并将其掺杂到MgB 2中，研究了掺杂浓度对不同粒径MgB 2的ΔTc的影响。结果表明，减小MgB 2颗粒尺寸可以提高非均匀相的最佳掺杂浓度，从而提高ΔTc。aMgB 2、bMgB 2和cMgB 2的最佳掺杂浓度分别为0.5%、0.8%和1.2%。相应的ΔTc值分别为0.4、0.9和1.2 K。这为进一步研究MgB 2 SMSCs中ΔTc的升高提供了新的途径。
英文摘要：
Incorporating with inhomogeneous phases with high electroluminescence (EL) intensity to prepare smart meta-superconductors (SMSCs) is an effective method of increasing the superconducting transition temperature (Tc) and has been confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of ΔTc 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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
