1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
2. Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5−13, 81377 München, Germany
3. Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
4. The Electron Microscopy Center, Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
5. Advanced Materials and Processing Laboratory, Research Division, Nissan Motor Co., Ltd., Natsushima-cho 1, Yokosuka, Kanagawa 237-8523, Japan