1. Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
2. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3. IMM Solid State Chemistry, Radboud University Nijmegen, Heijendaalseweg 135, NL-6525 AJ Nijmegen, The Netherlands
4. Energy Project & Technology Center, Naka Energy Research Laboratory, Mitsubishi Materials Corporation, 1002-14, Naka 311-0102, Japan
5. Division of Electrical, Electronic, and Information Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka, Suita 565-0871, Japan
6. Nanoelectronics Research Institute (NeRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan