1. National Institute for Materials Science (NIMS), Research Center for Functional Materials (RCFM), Tsukuba, Ibaraki 305-0044, Japan
2. NIMS, International Center for Materials Nanoarchitectonics (WPI-MANA), Tsukuba, Ibaraki 305-0044, Japan
3. Tosoh Corporation, Ayase, Kanagawa 252-1123, Japan
4. NIMS, Research and Services Division of Materials Data and Integrated System (MaDIS), Tsukuba, Ibaraki 305-0044, Japan