Phase stability and thermal equation-of-state of iron at moderate pressures

Details Phase stability and thermal equation-of-state of iron at moderate pressures Phase stability and thermal equation-of-state of iron at moderate pressures

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmmr31a0123g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #MR31A-0123

Physics

5430 Interiors (8147), 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

Iron is the most abundant element in the cores of terrestrial planets. The melting temperature of iron places a critical constraint on the temperature at the Earth's inner-outer-core boundary. The elastic properties of iron are important for modeling the geodynamic processes of the core. The phase stability and thermal equation-of-state of iron have been widely studied. Most studies have been carried out using diamond anvil cells (DAC) The data coverage at moderate pressures and high temperatures is relatively poor. In this work, we have determined the phase boundaries for solid-solid transition and melting of iron to 25 GPa and about 2400 K, using a large-volume press and synchrotron x-ray diffraction at SPring-8, Japan. Our new data also allow derivation of thermal equation-of state of iron. These results can be applied to models of proto-core of the Earth, and the current Martian core.

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