Melting relationships in the Fe-light elements system under outer core conditions

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800291
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Tohoku University
• Principal Investigator: Kamada Seiji 東北大学, 学際科学フロンティア研究所, 助教 (30611793)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 地球核 / 圧力媒体 / 静水圧性 / 高圧高温 / 放射光 / ダイヤモンドアンビルセル

Outline of Final Research Achievements

I have studied the physical properties of the Earth’s core using a diamond anvil cell. I used synchrotron radiation in order to know crystal structures, states of electron of Fe, and sound velocities of samples. The phase relationships in the Fe-S system were investigated over 200 GPa and Fe3S was stable up to 230 GPa and 3000 K. I investigated pressure distribution in the alkali halides such as KBr, KCl, and NaCl under high pressure. KCl and KBr seem to be good pressure media and thermal insulators. The magnetic property of Fe3S were studied using Synchrotron Mossbauer Spectrocopy and its magnetic property disappeared above 20 GPa. The sound velocities of Fe3S were measured based on inelastic X-ray scattering up to 50 GPa and 1900 K in order to discuss the Martian core. Electronic state of Fe in FeO was also investigated based on Synchrotron Mossbauer Spectrocopy under high pressure and temperature.

Free Research Field

高温高圧地球物質科学