1. Electro-Ceramics Group, Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
2. Solid-State NMR Group, Center for Basic Research on Materials, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan
3. Materials Fabrication and Analysis Platform, Research Network and Facility Services Division, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
4. CROSS Neutron Science and Technology Center, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan