Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Tectonophysics

[S-IT22] Interaction and Coevolution of the Core and Mantle in the Earth and Planets

Wed. May 23, 2018 10:45 AM - 12:15 PM International Conference Room (IC) (2F International Conference Hall, Makuhari Messe)

convener:Tsuyoshi Iizuka(University of Tokyo), Hidetoshi Shibuya(Department of Earth and Environmental Sciences, Faculty of Advanced Science and Technology, Kumamoto University), Taku Tsuchiya(愛媛大学地球深部ダイナミクス研究センター, 共同), Kenji Ohta(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Chairperson:Sumino Hirochika, Tateno Shigehiko, Iizuka Tsuyoshi

12:00 PM - 12:15 PM

[SIT22-24] Effects of light elements on transport properties of liquid Fe alloys under high pressure.

*Satoshi Ohmura1, Taku Tsuchiya2, Hiroki Ichikawa3 (1.Hiroshima Institute of Technology, 2.Ehime University, 3.Tokyo Institute of Technology)

Keywords:electrical conductivity, thermal conductivity, liquid Fe alloys, high pressure, ab initio molecular dynamics simulation

It is believed that Earth’s outer core consists of liquid iron (or liquid-nickel alloy) with light element impurities. For understanding magnetic and thermal behaviors of the Earth, it is required to investigate electrical and thermal conductivities of liquid iron and influence of the light elements on these properties. Several experimental studies investigated the electrical and thermal conductivities under high pressure by shock compression experiments (Keeler, 1969 : Bi ,2002) and by experiments in a laser-heated diamond anvil cell ( Ohta, 2016 : Konôpková 2016). First principle calculations also have been used to investigate transport properties of liquid iron and mixtures with silicon and oxygen. (Pozzo, 2012, 2013 : de Koker, 2012)

Under this circumstance, we have investigated effects of light elements (including all candidate other than silicon and oxygen) on transport properties of liquid Fe alloy under high pressure by using ab initio molecular dynamics simulations. To provide further details of the effects of light-element, in addition to the type of light element, we have investigated how much transport properties are affected by the amount of light elements. This time, we discuss effects of the light element on transport properties of liquid Fe alloys in terms of the type and amount of light elements.

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N de Koker, et al., Proc. Natl,. Acad. Sci. 109 4070 (2012)
M. Pozzo, et al., Phys. Rev. B 87 014110 (2013)
K. Ohta et al., Nature 534 95 (2016)
Z. Konôpková et al., Nature 534 99 (2016)