1. Department of Applied Science, University of California Davis, P.O. Box 808, L-794, Livermore, California 94550, Chemistry & Material Science Directorate, Lawrence Livermore National Laboratory, University of California P.O. Box 808, L-268, Livermore, California 94550, Glenn T. Seaborg Center, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050, China