In situ X-ray diffraction studies of iron to Earth-core conditions

Details In situ X-ray diffraction studies of iron to Earth-core conditions In situ X-ray diffraction studies of iron to Earth-core conditions

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..455m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 455-467.

Physics

75

Scientific paper

The high-pressure, high-temperature behavior of iron has been investigated to 161GPa and 3000K by in situ synchrotron X-ray diffraction with double-side laser-heated diamond anvil cells. We found that only α-, γ- and ɛ-Fe can be clearly verified as the stable solid phase in the P-T range studied. Only ɛ-Fe is observed from deep lower mantle (~1500km) to outer core conditions. Within the P-T range examined, we did not observe a significant change with pressure or temperature on the c/a ratio of ɛ-Fe. The melting curve of iron has been determined to 105GPa. A Lindeman law fit gives a melting point of iron at the inner core boundary of 5800 (+/-200)K, which provides an upper bound on the temperature at that depth. We also examine numerous experimental factors that may complicate the analysis of high P-T diffraction data, and discuss the effects of sample stress on the X-ray diffraction results.

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