1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes
2. National Laboratory of Mineral Materials
3. School of Materials Science and Technology
4. China University of Geosciences
5. Beijing
6. School of Physics and Electronic Engineering
7. Xinyang Normal University
8. Xinyang 464000
9. P. R. China
10. Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center
11. Tsinghua University
12. Beijing 100084
13. China
14. Department of Physics & Materials Science
15. City University of Hong Kong
16. Hong Kong