1. Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA.
2. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA.
3. High Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
4. Los Alamos Neutron Science Center (LANSCE), Los Alamos National Laboratory, Los Alamos, NM 87545, USA.