1. International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
2. Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0814, Japan
3. Department of Physics, Chuo University, Tokyo 112-8551, Japan
4. Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
5. Department of Physics, Triveni Devi Bhalotia College, Raniganj, West Bengal 713347, India
6. Transmission Electron Microscopy Station, NIMS, 1-2-1, Sengen, Tsukuba 305-0047, Japan
7. National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama, Nagoya 463-8560, Japan
8. Synchrotron X-ray Station at SPring-8, NIMS, 1-1-1 Kouto Sayo-cho Sayo-gun, Hyogo 679-5148, Japan
9. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada