Zhang Danlu, Sumption Mike D, Collings Edward William, Thong Chee J, Rindfleisch Matthew A
Center for Superconducting and Magnetic Materials, The Ohio State University, Columbus, OH 43210 USA.
IEEE Trans Appl Supercond. 2019 Aug;29(5). doi: 10.1109/tasc.2019.2905436. Epub 2019 Mar 15.
A series of SnO added MgB bulk superconductors were prepared by route to study the effect of oxygen doping on superconducting and structural properties of MgB. Several (MgB) (SnO) samples were fabricated with ranging from 0, 3 wt%, 4 wt%, and 6 wt%. Upper critical field ( ) and irreversible field ( ) were measured by physical property measurement system. Thermal analysis was performed on the as-received SnO powder. Critical current densities ( ) were obtained at 4.2 K using magnetic measurement. X-ray diffraction results showed evidence of full SnO decomposition in all the doped bulk samples and a shift of -axis in MgB lattice was seen. Oxygen was successfully released during heat treatment, yet no enhancement of or was seen, indicating that oxygen atoms did not end up in the host lattice. Further exploration of different processing procedures is still needed in order to get oxygen substitution on the host lattice sites.
通过[具体路线]制备了一系列添加SnO的MgB块状超导体，以研究氧掺杂对MgB超导和结构性能的影响。制备了几个（MgB）（SnO）样品，其中SnO的含量分别为0、3 wt%、4 wt%和6 wt%。通过物理性能测量系统测量了上临界场（ ）和不可逆场（ ）。对原样的SnO粉末进行了热分析。在4.2 K下使用磁测量获得了临界电流密度（ ）。X射线衍射结果表明，在所有掺杂的块状样品中都有SnO完全分解的迹象，并且在MgB晶格中观察到c轴的位移。在热处理过程中成功释放了氧，但未观察到 或 的增强，这表明氧原子并未进入主体晶格。为了使氧在主体晶格位置上发生取代，仍需要进一步探索不同的加工工艺。
