HR: 0830h
AN: V31D-0961    [PDF]
TI: Magnetic and structural transition in Fe$_{3}$S at high pressures
AU: * Shen, G
EM: shen@cars.uchicago.edu
AF: CARS, University of Chicago, 9700 S. Cass Ave, Argonne, IL 60437 United States
AU: Lin, J
EM: j.lin@gl.ciw.edu
AF: Geophysical Lab, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington DC, DC 20015 United States
AU: Fei, Y
EM: fei@gl.ciw.edu
AF: Geophysical Lab, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington DC, DC 20015 United States
AU: Mao, H
EM: mao@gl.ciw.edu
AF: Geophysical Lab, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington DC, DC 20015 United States
AU: Hu, M
EM: mhu@hpcat.aps.anl.gov
AF: Geophysical Lab, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington DC, DC 20015 United States
AU: Chow, P
EM: pchow@hpcat.aps.anl.gov
AF: Geophysical Lab, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington DC, DC 20015 United States
AB: Fe$_{3}$S, containing 16.1 wt$%$ sulfur, is the most iron rich compound in the Fe-FeS system. If sulfur is a dominant light element in an iron bearing planetary core, Fe$_{3}$S could be a major stable phase together with iron in a solid core. We have studied magnetic properties of Fe$_{3}$S at high pressures to 31 GPa in a diamond anvil cell. The Fe$_{3}$S sample was synthesized in a large volume press. By measuring the pressure dependence of Fe K$\beta$ fluorescence line using x-ray emission spectroscopy, we have observed a magnetic transition in Fe$_{3}$S at pressures around 20-25 GPa and at room temperature. The relative intensities of spectral features indicate the collapse of the 3d electron magnetic moment at the transition. This magnetic transition is found to be reversible with pressure, and associated with a structural transition as evidenced from x-ray diffraction measurements.
DE: 3924 High-pressure behavior
DE: 3954 X ray, neutron, and electron spectroscopy and diffraction
DE: 8124 Earth's interior--composition and state (old 8105)
DE: 8147 Planetary interiors (5430, 5724)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting