HR: 0800h
AN: MR31A-0124    [Abstracts]
TI: High-Pressure Experiments on FeO up to 200 GPa
AU: * Sata, N
EM: sata@jamstec.go.jp
AF: Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technolgy, 2-15 Natsushima-cho, Yokosuka-shi, KAN 237-0061 Japan
AU: Hirose, K
EM: kei@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, TOK 152-8551 Japan
AU: Ohishi, Y
EM: ohishi@spring8.or.jp
AF: Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, HYO 679-5198 Japan
AU: Shen, G
EM: shen@cars.uchicago.edu
AF: Consortium for Advanced Radiation Sources, University of Chicago, 9700 South Cass Avenue, Argonne, IL 60439 United States
AB: Even if FeO itself supposed to be not exiting in both the Earth's mantle and the core, understandings of its properties are important as an end-member of both mantle and core minerals. Goals of this study are investigation of stable phase of FeO and measurements of its density under the Earth's core conditions. High-pressure and high-temperature x-ray diffraction experiments were carried out up to around 200 GPa at 1500 K using a laser heated diamond anvil cell with synchrotron x-ray. Experimental procedures are as follows: increasing target pressure, heating at 1500 K, quench to room temperature, and increasing next target pressure. X-ray diffractions were measured before, during, and after heating at each target pressure. Using NaCl pressure medium, the cubic B1 phase was observed up to around 150 GPa at 1500K. Over 150 GPa, new diffraction peaks were observed up to around 200 GPa . These peaks can be indexed by another cubic cell. However, using Ar pressure medium, the cubic B1 phase was observed up to around 180 GPa and not observed the other cubic phase. These suggest that possibility of reactions between FeO and NaCl over 150 GPa and the cubic B1 phase is still stable at least up to 180 GPa.
DE: 3924 High-pressure behavior
DE: 3954 X-ray, neutron, and electron spectroscopy and diffraction
SC: Mineral and Rock Physics [MR]
MN: Fall Meeting 2005