Employment of NdBCO/YBCO/MgO film seed in the infiltration growth technique for fabricating single-grain YBCO bulk superconductors
Employment of NdBCO/YBCO/MgO film seed in the infiltration growth technique for fabricating single-grain YBCO bulk superconductors
复制标题
NdBCO/YBCO/MgO薄膜种子在渗透生长技术中用于制造单晶YBCO体超导体
DOI：
10.1016/j.jcrysgro.2021.126198
复制
发表时间：
2021-05-31
影响因子：
1.8
通讯作者：
Wang, Miao
中科院分区：
文献类型：
--
作者：
Li, Guo-Zheng;Wang, Miao
种子的质量是生长出良好的c轴取向RE - Ba - Cu - O（REBCO）单晶晶粒超导材料的关键因素。在本研究中，将商用的NdBCO/YBCO/MgO薄膜（在MgO衬底上有300nm的NdBCO以及20nm的YBCO缓冲层）用作渗透生长（IG）法中生长YBCO单晶晶粒的种子，包括传统的211 - IG和新型的011 - IG技术。并且在011 - IG技术中采用了嵌入式种子模式以防止薄膜在热处理过程中移动。结果表明，在两种IG工艺中通过NdBCO/YBCO/MgO薄膜作为种子成功地生长出了YBCO单晶晶粒，这证明了薄膜种子在IG方法中的可行性。样品顶面上四个严格垂直的生长扇形边界以及X射线衍射（XRD）结果中清晰的（0 0 l）衍射峰都表明了样品具有高c轴取向和良好的生长质量，这证明了NdBCO/YBCO/MgO薄膜种子在IG方法中具有优异的性能。超导性能测量表明，011 - IG的YBCO样品比211 - IG样品表现出更强的悬浮力和Jc特性。
The quality of the seed is a key factor for growing well c-axis oriented RE-Ba-Cu-O (REBCO) single-grain superconductors. In this study, the commercial NdBCO/YBCO/MgO film (300 nm NdBCO with 20 nm YBCO buffer layer on MgO substrate) is employed as seed in the infiltration growth (IG) method for growing YBCO single grains, including the conventional 211-IG and the novel 011-IG techniques. And an embedded seed mode was used for preventing the movement of the thin film during heat treatment process in the 011-IG technique. The results indicate that, YBCO single grains have been successfully grown via the seeding of NdBCO/YBCO/MgO film in the two IG processes, which proves the feasibility of the film seed in the IG method. Four strictly perpendicular growth sector boundaries on the top surface of the samples and clear (0 0 l) diffraction peaks in the X-ray diffraction (XRD) results both indicate the high c-axis orientation and well growth quality of the samples, which proves the excellent performance of the NdBCO/YBCO/MgO film seed in the IG method. Superconducting property measurement showed that, the 011-IG YBCO sample exhibited enhanced levitation force and Jc properties than the 211-IG sample.