Inhomogeneous Phase Effect of Smart Meta-Superconducting $$\hbox {MgB}_{2}$$ MgB 2

• DOI: 10.1007/s10909-018-1865-8
• Publication Date: 2018-02-21T14:32:48Z
• Authors: Yongbo Li; Honggang Chen; Weichang Qi; Guowei Chen; Xiaopeng Zhao
• Keywords: 0103 physical sciences; 01 natural sciences

The inhomogeneous phase of a smart meta-superconductor has a great effect on its superconductivity. In this paper, the effect of concentration, dimensions, electroluminescence (EL) intensity, and distribution of the inhomogeneous phase on the superconducting critical temperature $$(T_{C})$$ has been systematically investigated. An ex situ solid sintering was utilized to prepare smart meta-superconducting $$\hbox {MgB}_{2}$$ doped with six kinds of electroluminescent materials, such as $$\hbox {YVO}_{4}{:}\hbox {Eu}^{3+}$$ and $$\hbox {Y}_{2}\hbox {O}_{3}{:}\hbox {Eu}^{3+}$$ flakes. Elemental mappings through energy dispersive spectroscopy (EDS) show that the inhomogeneous phase is comparatively uniformly dispersed around the $$\hbox {MgB}_{2}$$ particles; thus V, Y, and Eu were accumulated at a small area. The measurement results show that the optimum doping concentration of the meta-superconducting $$\hbox {MgB}_{2}$$ is 2.0 wt%. The offset temperature ( $$T_{C}^{{ off}}$$ ) of the sample doped with 2.0 wt% dopant A is 1.6 K higher than that of pure $$\hbox {MgB}_{2}$$ . The improvement in $$T_{C}^{{ off}}$$ is likely related to the sizes, thickness, and EL intensity of the inhomogeneous phase of $$\hbox {MgB}_{2}$$ smart meta-superconductor. This experiment provides a novel approach to enhance $$T_{C}$$ .