1. Center for Nanoscale Materials; Argonne National Laboratory; 9700, South Cass Avenue Argonne Illinois 60439 USA
2. HPSync, Geophysical Laboratory; Carnegie Institute of Washington; Argonne Illinois 60439 USA
3. State Key Laboratory of Superhard Materials; Jilin University; Changchun 130012 China
4. Center for High Pressure Science and Technology Advanced Research; 1690 Cailun Rd Pudong District Shanghai 201203 China
5. X-Ray Science Division; Advanced Photon Source; Argonne National Laboratory; 9700 South Cass Avenue Argonne Illinois 60439 USA