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High-pressure melting of iron: New experiments and calculations

Chen, George Q. and Ahrens, Thomas J. (1996) High-pressure melting of iron: New experiments and calculations. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences, 354 (1711). pp. 1251-1263. ISSN 1364-503X. doi:10.1098/rsta.1996.0047.

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The melting curve of ε-iron in the pressure range of 100 GPa to 300 GPa has been derived by computing Gibbs free energies at high pressures and high temperatures from equation of states (EOS) of the α-, ε- and liquid phases. Our calculations indicate that the melting curve of iron is very sensitive to the EOS of both the solid (ε) and melt phases. Optimal EOS parameters for ε-iron are presented as well as new data for sound velocities in γ- and liquid phases. The latter provides a value for the Gruneisen parameter for liquid iron of 2.55 at 9.7 Mg m^(-3) at a pressure of 74 GPa. Preliminary shock-wave experiments on pure iron preheated to 1300 °C were conducted in the 17-74 GPa range. Melting was observed in the highest pressure (74 GPa) experiment. This result supports our theoretically derived melting curve, which is close to those measured by Boehler (1993) and Saxena et al. (1993).

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Additional Information:© 1996 The Royal Society. Published 15 June 1996. Research supported by NSF. We thank William Anderson for helpful discussions, Wenbo Yang, Mike Long and E. Celle's assistance in the experiments and Andrew Jephcoat and two anonymous referees for helpful comments. Contribution # 5524, Division of Geological and Planetary Sciences, California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences5524
Issue or Number:1711
Record Number:CaltechAUTHORS:20141023-155620346
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Official Citation:George Q. Chen and Thomas J. Ahrens High-Pressure Melting of Iron: New Experiments and Calculations Phil. Trans. R. Soc. Lond. A June 15, 1996 354 1711 1251-1263; doi:10.1098/rsta.1996.0047 1471-2962
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50759
Deposited By: Tony Diaz
Deposited On:23 Oct 2014 23:15
Last Modified:10 Nov 2021 19:00

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