1. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2. College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121000, China
3. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China