1. Tokyo Institute of Technology Institute of Innovative Research 4259 Nagatsuta, Midori-ku 226-8503 Yokohama Japan
2. Yokohama National University Division of Materials Science and Chemical Engineering 79-5 Tokiwadai, Hodogaya-ku 240-8501 Yokohama Japan
3. Ruhr-University Bochum Institute of Geology, Mineralogy und Geophysics 44780 Bochum Germany
4. National Institute of Technology and Evaluation Shibuya-ku 151-0066 Tokyo Japan