1. Harbin Institute of Technology Harbin 150080 P.R. China
2. Center for High Pressure Science Technology Advanced Research Changchun 130015 P.R. China
3. School of Mechanical and Mining Engineering The University of Queensland Brisbane Queensland 4072 Australia
4. X‐ray Science Division, Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA
5. Center for Advanced Energy Studies University of Idaho Idaho Falls Idaho 83406 USA