Phase relations of Fe Ni alloys at high pressure and temperature

Details Phase relations of Fe Ni alloys at high pressure and temperature Phase relations of Fe Ni alloys at high pressure and temperature

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pepi..155..146m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 155, Issue 1-2, p. 146-151.

Physics

12

Scientific paper

Using a diamond anvil cell and double-sided laser-heating coupled with synchrotron X-ray diffraction, we determined phase relations for three compositions of Fe-rich FeNi alloys in situ at high pressure and high temperature. We studied Fe with 5, 15, and 20 wt.% Ni to 55, 62, and 72 GPa, respectively, at temperatures up to ˜3000 K. Ni stabilizes the face-centered cubic phase to lower temperatures and higher pressure, and this effect increases with increasing pressure. Extrapolation of our experimental results for Fe with 15 wt.% Ni suggests that the stable phase at inner core conditions is hexagonal close packed, although if the temperature at the inner core boundary is higher than ˜6400 K, a two phase outer region may also exist. Comparison to previous laser-heated diamond anvil cell studies demonstrates the importance of kinetics even at high temperatures.

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