1. Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan
2. Sialon
Group, National Institute for Materials Science, Namiki 1-1, Tsukuba 305-0044, Japan
3. Product
and Process Engineering, Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 JB Delft, The Netherlands
4. High
Field NMR Group, National Institute for Materials Science, Sakura
3-13, Tsukuba 305-0003, Japan
5. College
of Materials, Xiamen University, 422 Siming Road, Xiamen 361005, China