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采用固态反应法制备了纯MgB2和C掺杂MgB2超导体。采用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)和物性测试仪(PPMS)研究了纯MgB2超导块材和C掺杂的MgB2超导块材的水解行为对微观结构和超导电性的影响。结果表明,纯MgB2和C掺杂的MgB2超导体与水之间存在明显的化学反应。C掺杂部分进入MgB2的晶格中,其余部分以第二相粒子形式存在于晶界处,使得首先发生于晶界的水解反应受到抑制,从而提高了MgB2超导体的水解稳定性,减缓了水解反应速度。
Pure MgB2 and C-doped MgB2 superconductors were prepared by solid-state reaction. The effects of hydrolysis behavior of pure MgB2 superconducting bulk material and C-doped superconducting MgB2 superconducting material on the microstructure were studied by XRD, SEM, EDS and PPMS. Structure and superconductivity. The results show that there is a clear chemical reaction between pure MgB2 and C-doped MgB2 superconductors and water. The C-doped part enters into the lattice of MgB2, and the rest exists as second phase particles at the grain boundaries, so that the hydrolysis reaction first occurring at grain boundaries is inhibited, thereby improving the hydrolytic stability of the MgB2 superconductors and slowing the hydrolysis reaction speed.