Chen Honggang, Wang Mingzhong, Qi Yao, Li Yongbo, Zhao Xiaopeng
Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
Nanomaterials (Basel). 2021 Apr 21;11(5):1061. doi: 10.3390/nano11051061.
A smart meta-superconductor Bi(Pb)SrCaCuO (B(P)SCCO) may increase the critical transition temperature () of B(P)SCCO by electroluminescence (EL) energy injection of inhomogeneous phases. However, the increase amplitude Δ (ΔTC=TC-TC,pure) of is relatively small. In this study, a smart meta-superconductor B(P)SCCO with different matrix sizes was designed. Three kinds of raw materials with different particle sizes were used, and different series of YO:Sm, YO, YO:Eu, and YO:Eu+Ag-doped samples and pure B(P)SCCO were prepared. Results indicated that the of the YO or YO:Sm non-luminescent dopant doping sample is lower than that of pure B(P)SCCO. However, the of the YO:Eu+Ag or YO:Eu luminescent inhomogeneous phase doping sample is higher than that of pure B(P)SCCO. With the decrease of the raw material particle size from 30 to 5 μm, the particle size of the B(P)SCCO superconducting matrix in the prepared samples decreases, and the doping content of the YO:Eu+Ag or YO:Eu increases from 0.2% to 0.4%. Meanwhile, the increase of the inhomogeneous phase content enhances the Δ. When the particle size of raw material is 5 μm, the doping concentration of the luminescent inhomogeneous phase can be increased to 0.4%. At this time, the zero-resistance temperature and onset transition temperature of the YO:Eu+Ag doped sample are 4 and 6.3 K higher than those of pure B(P)SCCO, respectively.
一种智能元超导体Bi(Pb)SrCaCuO（B(P)SCCO）可通过非均匀相的电致发光（EL）能量注入来提高B(P)SCCO的临界转变温度（）。然而，的增加幅度Δ（ΔTC=TC-TC,pure）相对较小。在本研究中，设计了具有不同基体尺寸的智能元超导体B(P)SCCO。使用了三种不同粒径的原材料，制备了不同系列的YO:Sm、YO、YO:Eu和YO:Eu+Ag掺杂样品以及纯B(P)SCCO。结果表明，YO或YO:Sm非发光掺杂剂掺杂样品的低于纯B(P)SCCO的。然而，YO:Eu+Ag或YO:Eu发光非均匀相掺杂样品的高于纯B(P)SCCO的。随着原材料粒径从30μm减小到5μm，制备样品中B(P)SCCO超导基体的粒径减小，YO:Eu+Ag或YO:Eu的掺杂含量从0.2%增加到0.4%。同时，非均匀相含量的增加增强了Δ。当原材料粒径为5μm时，发光非均匀相的掺杂浓度可提高到0.4%。此时，YO:Eu+Ag掺杂样品的零电阻温度和起始转变温度分别比纯B(P)SCCO高4K和6.3K。
