The phase diagram of iron to 430 kbar

Details The phase diagram of iron to 430 kbar The phase diagram of iron to 430 kbar

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1153b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Nov. 1986, p. 1153-1156. DOE-supported research.

Physics

75

Earth Core, High Pressure, Iron, Phase Diagrams, Anvils, Melting, Pressure Measurement, Temperature Measurement

Scientific paper

The epsilon-gamma transition and the melting curve of pure iron have been measured in an internally heated diamond cell to 430 kbar. New data on the alpha-epsilon transition by Huang et al. (1986) and the present result on the epsilon-gamma transition yield a alpha-epsilon-gamma triple point of 116 kbar and 810 K. The slope of the epsilon-gamma transition is 2.9 K/kbar. At 500 kbar the present melting temperatures of iron are about 1000 K lower than those calculated by Anderson (1986). From this data, one would expect a epsilon-gamma-1 triple point at 750 kbar and 2500 K. The solid-solid transition found in shock wave experiments at 2 Mbar could therefore be the appearance of a new iron phase, which would be the phase of the inner core of the earth.

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