R3：高圧科学・地球深部

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

*生田 大穣¹、大谷 栄治¹、福井 宏之^2,3、境 毅⁴、石川 大介^2,3、バロン アルフレッド^2,3 (1. 東北大・理・地学、2. 理研、3. JASRI、4. 愛媛大・GRC)

キーワード：音速、鉄、内核、高圧、非弾性X線散乱

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.