1. College of Materials Science and Engineering
2. Taiyuan University of Technology
3. Taiyuan 030024
4. P. R. China
5. I. Physikalisches Institut (IA)
6. RWTH Aachen University
7. 52074 Aachen
8. Germany
9. College of Physics and Optoelectronics
10. Institute of Advanced Forming and Intelligent Equipment
11. Analytical Instrumentation Center
12. State Key Laboratory of Coal Conversion
13. Institute of Coal Chemistry
14. Chinese Academy of Sciences
15. Taiyuan 030001
16. Department of Materials Science and Engineering
17. Northwestern University
18. Evanston
19. USA