Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 13, Pages 5206-5211Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL064496
Keywords
nitrogen; iron nitride; core; phase transition; high pressure
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We have examined the phase relations in the iron-rich portion of the Fe-N binary system up to 150GPa and 2720K in a laser-heated diamond anvil cell. Synchrotron X-ray diffraction measurements revealed the formation of a new phase (-Fe7N3) above 41GPa and similar to 1000K. The phase is structurally identical or very close to Fe7C3 and the most iron-rich Fe-N intermediate compound at its stability field. We also measured the volume of -Fe7N3 to 132GPa and found its elastic property very similar to that of Fe7C3. Recently, it has been proposed that the density and sound velocities, in particular, shear wave velocity, in the Earth's inner core are reconciled with Fe7C3, but such properties could be explained by -Fe7N3 equally well. It is therefore possible that the inner core consists of Fe-7(C,N)(3), which is found as diamond inclusions and likely stable under inner core conditions.
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