1. Division
of Materials Science and Tsukuba Research Center for Interdisciplinary
Materials Science (TIMS), Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
2. Department
of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka,
Shinjuku, Tokyo 162-8601, Japan
3. Transmission
Electron Microscopy Station, National Institute for Materials Science (NIMS), 1-2-1,
Sengen, Tsukuba, Ibaraki 305-0047, Japan