Important research of domestic cooperation

"863" projects( the Minister of Science and Technology)

Novel seeds, phase relation and large-sized REBCO superconductor bulk growth

High quality RE-Ba-Cu-O (REBCO, RE = rare earth) single crystal domains can be produced by top-seeding melt-texturing (TSMT) techniques. Such domains have a significant potential for a wide range of applications, including magnetic bearings (flywheels for energy storage, and the generation of high magnetic field (superconducting pseudo permanent magnets).

For these applications, the functional properties are related directly to the flux trapping capability of the material, which is correlated closely with its micro and macrostructure, and hence related to the crystal growth conditions. This project is to perform basic research on the crystal growth mechanism of REBCO superconductors by top seeding methods, and focus on the following tasks: 1) Search for a universal seed (e.g. superheating-film seed) to grow REBCO high superconducting bulk by cold-seeding process; 2) Study of the phase relations to optimizing processes for chemical stoichiometry control of RE123 with high superconducting properties, and for high growth rate; 3) Elaboration of large YBCO bulk for applications, i.e. large area, no cracks, strong mechanical properties and high trapped values.

This project is led by Prof. Xin Yao (xyao@sjtu.edu.cn).

Study on the second-generation (2G) high temperature superconductors (HTS) tapes

2G HTS tapes have potential applications in cables, motors, generators and fault current limiters with lighter, smaller, safer and more efficient than their conventional counterparts. By investigating the fabrication of buffer, superconductor and protective layers, it is expected to achieve the long length of 2G HTS tapes for industry application. In order to achieve the 2G HTS tapes with high performance, study is mainly focused on epitaxy growth, flux pinning and fast fabrication of superconductor layer with high current.

This project is led by Prof. Yijie Li (yjli@sjtu.edu.cn).

The Ministry of Science and Technology of China, 863 Program Key Project: “Fabrication of Functional Layers for Second Generation High Temperature Superconducting Tapes”. Project Leader: Prof. Li Yi-jie, research fund RMB 13,220,000 (2009AA032402).

The Ministry of Science and Technology of China, National Major Basic Research Project: “Application of Silicon Nanostructures in High Efficiency Solar Cells”. Project Leader: Prof. Shen Wen-zhong, research fund RMB 3,110,000 (2010CB933702).

Natural Science Foundation of China, Key Project: “Quantum Transport and Control in Novel Semiconductor Nanostructures”. Project Leader: Prof. Shen Wen-zhong, research fund RMB 2,100,000 (10734020).