1. Institute for Materials Research (IMR) Tohoku University Katahira 2‐1‐1 Aoba‐ku Sendai 980‐8577 Japan
2. Frontier Technology Business Research Institute Co. Ltd. Yamazaki Umenodai 11‐9 Noda 278‐0024 Japan
3. Union Materials Inc. Oshido 1640 Tone‐machi Kitasoma‐gun, Ibaraki 300‐1602 Japan