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Equations of state of α , ϵ and liquid iron and Iron's melting curve—thermodynamic calculations
Author(s) -
Chen Guangqing,
Ahrens Thomas J.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02892
Subject(s) - thermodynamics , solidus , melting curve analysis , equation of state , phase (matter) , gibbs free energy , materials science , chemistry , physics , metallurgy , polymerase chain reaction , biochemistry , organic chemistry , alloy , gene
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.