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Equations of state of α, ϵ and liquid iron and Iron's melting curve —thermodynamic calculations

Chen, Guangqing and Ahrens, Thomas J. (1995) Equations of state of α, ϵ and liquid iron and Iron's melting curve —thermodynamic calculations. Geophysical Research Letters, 22 (1). pp. 21-24. ISSN 0094-8276. doi:10.1029/94GL02892.

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The melting curve between ϵ and liquid iron (100GPa< P <300GPa) has been derived by computing Gibbs free energies at high pressures and high temperatures from equations of state of the α, ϵ and liquid phases. The most uncertainty lies in the equation of state (EOS) of the ϵ phase. By comparing the calculations to experimental data, the internal thermodynamic consistency of the three phases are examined. The best fits to the melting curves of Boehler [1993] and Williams et al. [1987] can be obtained with lower bulk moduli than determined by static compression. Using available equations of state of the iron phases, our calculations indicate that if sub-solidus iron is of the ϵ phase, Boehler's melting curve is thermodynamically more consistent than Williams et al.'s. The problem is complicated by the possible existence of a new phase between the ϵ and the liquid fields.

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Additional Information:Copyright 1995 by the American Geophysical Union. (received October 17, 1994; accepted November 1, 1994.) Paper number 94GL02892. Research supported by NSF. We thank William Anderson for helpful discussions. Contribution # 5433, Division of Geology and Planetary Sciences, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences5433
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Deposited By: George Porter
Deposited On:27 Oct 2014 03:04
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