1. Department of Physics, University of Alabama at Birmingham, Birmingham, AL, USA
2. HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL, USA
3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
4. Materials Science and Engineering Department, University of Tennessee, Knoxville, TN, USA
5. Ceramics and Transparent Materials Branch, U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, USA