First-principles thermoelasticity of bcc iron under pressure

Details First-principles thermoelasticity of bcc iron under pressure First-principles thermoelasticity of bcc iron under pressure

2006-12-12

arxiv.org/abs/cond-mat/0612308v1

Physics

Condensed Matter

Materials Science

5 figures, 2 tables

Scientific paper

10.1103/PhysRevB.74.214111

We investigate the elastic and isotropic aggregate properties of ferromagnetic bcc iron as a function of temperature and pressure by computing the Helmholtz free energies for the volume-conserving strained structures using the first-principles linear response linear-muffin-tin-orbital method and the generalized-gradient approximation. We include the electronic excitation contributions to the free energy from the band structures, and phonon contributions from quasi-harmonic lattice dynamics. We make detailed comparisons between our calculated elastic moduli and their temperature and pressure dependences with available experimental and theoretical data.

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