Abstract
On the basis of latest experimental data and ab‐initio calculations the multy‐phase equation of state for iron taking into account α, e, γ and liquid phases has been constructed and the phase diagram has been calculated. Free energy of solid phases is written as a sum of four terms corresponding to static lattice potential, lattice phonon free energy, magnetic term (for α phase only) and free energy due to thermal exitations of electrons. The last term instead of traditionally used square law was determined using Fermi‐Dirac statistics and the one‐particle spectrum of a crystal calculated for T=0K. Lattice contribution is described by high‐temperature expansion of Debay model and static potential is an approximation of ab‐initio calculations and experimental data on static compression. To evaluate the equation of state for a liquid phase we used Grover model. Obtained results are in good agreement with thermophysical, phase boundary and shock wave measurements. Up‐to‐date ideas about layout of iron phase ...
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