*Masaaki Miyahara¹, Junnosuke Edanaga¹, Akira Yamaguchi², Takamichi Kobayashi³, Toshimori Sekine^4,5 (1.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 2.National Institute of Polar Research, 3.National Institute for Materials Science, 4.Center for High-Pressure Science and Technology Advanced Research, 5.Graduate School of Engineering, Osaka University)