1. High Pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
2. Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
3. State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
4. Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States