Ultrahigh-Pressure Material Science of the central regions of the Earth and Planets

2014 Fiscal Year Final Research Report

• Project/Area Number: 22000002
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Mathematics and Physics
• Research Institution: Tohoku University
• Principal Investigator: OHTANI Eiji 東北大学, 大学院理学研究科, 教授 (60136306)
• Co-Investigator(Kenkyū-buntansha): MURAKAMI Motohiko 東北大学, 大学院理学研究科, 准教授 (50401542) ; SUZUKI Akio 東北大学, 大学院理学研究科, 准教授 (20281975) ; TERASAKI Hidenori 大阪大学, 大学院理学研究科, 准教授 (50374898) ; HIRAO Naohisa (財)高輝度光科学研究センター, 利用研究促進部門, 研究員 (70374915) ; MIYAHARA Masaaki 広島大学, 大学院理学研究科, 准教授 (90400241) ; FUKUI Hiroshi 兵庫県立大学, 大学院物質理学研究科, 助教 (90397901)
• Co-Investigator(Renkei-kenkyūsha): SAKAI Takeshi 愛媛大学, 地球深部ダイナミクスセンター, 助教 (90451616) ; SAKAMAKI Tatsuya 東北大学, 大学院理学研究科, 助教 (30630769) ; KAMADA Seiji 東北大学, 大学院理学研究科, 助教 (30611793)
• Project Period (FY): 2010-04-21 – 2015-03-31
• Keywords: 地球惑星物質 / 地球惑星進化 / 地殻・マントル・核 / 鉱物物理

Outline of Final Research Achievements

We determined the melting relations of Fe-S, Fe-C, Fe-H, Fe-Ni and Fe-S-Si, Fe-S-H systems, and compression of hcp-FeNiSi and hcp-FeNiS alloys, Fe_3S, and Fe3C to the core conditions. We also successfully measured compressional velocity of hcp-iron to 173 GPa at 3000 K, which are the data determined at the highest pressure and temperature by the IXS method. We also determined the spin-state and magnetic properties of the iron-oxides and iron-light element compounds at high pressure. Based on these experimental results we proposed the model of the composition and the temperature profile of the core.

Free Research Field

数物系科学