1. Center for High Pressure Science and Technology Advanced Research (HPSTAR), 1690 Cailun Road, Pudong, Shanghai 201203, People's Republic of China
2. HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
3. Institute of Amorphous Matter Science, School of Materials Science and Engineering and Anhui Provincial Key Lab of Functional Materials and Devices, Hefei University of Technology, Hefei 230009, China
4. Geological Sciences, Stanford University, Stanford, California 94305, USA
5. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA