1. School of Materials Science and Engineering
2. Zhengzhou University
3. Zhengzhou 450001
4. China
5. Graduate School of Human and Environmental Studies
6. Kyoto University
7. Kyoto 606-8501
8. Japan
9. College of Sciences
10. Chongqing University of Posts and Telecommunications
11. Chongqing 400065
12. Institute of Physics
13. Materials Science & Technology Division
14. Oak Ridge
15. USA