Magnetic transition of iron carbide at high pressures

Details Magnetic transition of iron carbide at high pressures Magnetic transition of iron carbide at high pressures

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pepi..180....1o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 180, Issue 1-2, p. 1-6.

Physics

6

Scientific paper

High-pressure experiments and first-principles calculations were performed to investigate the compressibility and the magnetic properties of the iron carbide system, Fe3C. The experimental data indicate that a significant reduction in volume occurs without any major structural changes at 55 GPa. Our calculations show that this reduction in volume corresponds to a magnetic collapse from the ferromagnetic to the non-magnetic state. The magnetic phase diagram of Fe3C indicates that the non-magnetic state is stable under the conditions of the Earth's inner core. The equation of state for non-magnetic Fe3C up to 400 GPa was also studied to assess this materials as a candidate as a major component of the Earth's inner core. The isothermal bulk modulus of non-magnetic Fe3C at 0 K was found to be about twice as high as the experimental value of ferromagnetic Fe3C. The density of non-magnetic Fe3C is much lower than that in the inner core, as determined from the PREM model. This indicates that it is not possible that Fe3C is a major component of the Earth's inner core.

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