HR: 1340h
AN: MR13A-0992    [Abstracts]
TI: The effects of temperature and light elements on the interfacial tension of liquid iron under high pressure
AU: * Terasaki, H
EM: terasaki@ganko.tohoku.ac.jp
AF: Department of Earth and Planetary Materials Science, Tohoku University, Aoba-ku Aramaki Aoba, Sendai, 980-8578, Japan
AU: Urakawa, S
AF: Department of Earth science, Okayama University, 3-1-1 Tsushima Naka, Okayama, 700- 8530, Japan
AU: Funakoshi, K
AF: Japan Synchrotron Radiation Research Institute, Sayocho Kouto 1-1-1, Hyogo, 679-5198, Japan
AU: Ohtani, E
AF: Department of Earth and Planetary Materials Science, Tohoku University, Aoba-ku Aramaki Aoba, Sendai, 980-8578, Japan
AU: Suzuki, A
AF: Department of Earth and Planetary Materials Science, Tohoku University, Aoba-ku Aramaki Aoba, Sendai, 980-8578, Japan
AU: Nishida, K
AF: Department of Earth and Planetary Materials Science, Tohoku University, Aoba-ku Aramaki Aoba, Sendai, 980-8578, Japan
AU: Sakamaki, T
AF: Department of Earth and Planetary Materials Science, Tohoku University, Aoba-ku Aramaki Aoba, Sendai, 980-8578, Japan
AU: Nishiyama, N
AF: Geodynamics Research Center Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan
AU: Nishiyama, N
AF: GSECARS, University of Chicago, 9700 South Cass Avenue, Bldg. 434A, Argonne, IL 60439, United States
AU: Wang, Y
AF: GSECARS, University of Chicago, 9700 South Cass Avenue, Bldg. 434A, Argonne, IL 60439, United States
AB: Interfacial tension is one of the most important properties of liquid iron-alloy to control the core formation process in the Earth and planets. The aim of this study is to clarify the effects of temperature and light elements (S and P) on the interfation tension of liquid iron under high pressure. In this study, high pressure in-situ measurement of interfacial tension was carried out for the liquid Fe-S and Fe-P alloys using sessile drop method combined with X-ray radiography technique up to 2 GPa and 1923 K. The sessile drop method has been widely used for measurement of surface and interfacial tensions at ambient pressure. The effect of temperature on the interfacial tension for both Fe-S and Fe-P liquids is quite small in the range of measurement (1623 – 1923 K). The interfacial tension of liquid Fe-S decreases linearly from 802 to 112 mN/m with increasing sulphur content of 0 - 40 at%. Thus, sulphur reduces significantly the interfacial tension of liquid iron. On the other hand, phosphorus does not affect to the interfacial tension of liquid iron. These tendencies are in good agreement with the data measured at ambient pressure. Therefore, the behaviour of light elements on the interface at ambient pressure is maintained at least up to 2 GPa and the effect of light elements on the interfacial tension of liquid iron depends on the element species. The shape change of the liquid Fe-S was observed before and after quenching. This suggests that the in-situ measurement at high pressure and temperature is essential in order to obtain the true interfacial tension, i.e. interconnectivity of liquid iron-alloy.
DE: 3924 High-pressure behavior
DE: 3947 Surfaces and interfaces
DE: 5139 Transport properties
DE: 7207 Core (1212, 1213, 8124)
DE: 8125 Evolution of the Earth (0325)
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting