1. School of Sciences
2. Hebei University of Science and Technology
3. Shijiazhuang 050018
4. China
5. Engineering Laboratory of Nuclear Energy Materials
6. Ningbo Institute of Industrial Technology & Engineering
7. Chinese Academy Sciences
8. Ningbo
9. P. R. China
10. School of Physical Science and Technology
11. ShanghaiTech University
12. Shanghai 201210
13. Department of Applied Physics
14. Northwestern Polytechnical University
15. Xi'an 710072