1. State Key Laboratory of Superhard Materials
2. Jilin University
3. Changchun 130012
4. China
5. State Key Laboratory of Metastable Materials Science and Technology
6. Yanshan University
7. Qinhuangdao 066004
8. Geophysical Laboratory
9. Carnegie Institution of Washington
10. Washington D.C. 20015
11. USA
12. Department of Physics and Engineering Physics