R3: High-pressure science and deep Earth’s material

[R3-10] Sound velocity of hcp-iron to the inner core pressure, and light elements in the inner core

*Daijo Ikuta¹, Eiji Ohtani¹, Hiroshi Fukui^2,3, Takeshi Sakai⁴, Daisuke Ishikawa^2,3, Alfred Q. R. Baron^2,3 (1. Tohoku Univ. Dept. Earth Sci., 2. RIKEN, 3. JASRI, 4. Ehime Univ. GRC)

Keywords:sound velocity, iron, inner core, high pressure, inelastic x-ray scattering

In this study, we have conducted sound velocity measurements of hcp-iron with inelastic x-ray scattering (IXS) method to the Earth's inner core pressure by using a newly designed diamond anvil "stepped bevel" type for extreme pressure generations, and the Soller screen system for reducing noises. The experiments were succeeded to obtained reasonable IXS peaks from hcp-iron. The experimental density of hcp-iron reached up to 13.87 g/cm³, the maximum pressure is about 310-330 GPa, and we succeeded to derive sound velocity of hcp-iron at the Earth's inner core pressures.