Interatomic potentials for hydrogen in α -iron based on density functional theory

Ashwin Ramasubramaniam, Mitsuhiro Itakura, Emily A. Carter

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128 Scopus citations

Abstract

We present two interatomic potentials for hydrogen in α -iron based on the embedded atom method potentials for iron developed by Mendelev [Philos. Mag. 83, 3977 (2003)] and Ackland [J. Phys.: Condens. Matter 16, S2629 (2004)]. Since these latter potentials are unique among existing iron potentials in their ability to produce the same core structure for screw dislocations as density functional theory (DFT) calculations, our interatomic potentials for hydrogen in iron also inherit this important feature. We use an extensive database of energies and atomic configurations from DFT calculations to fit the cross interaction of hydrogen with iron. Detailed tests on the dissolution and diffusion of hydrogen in bulk α -iron, as well as the binding of H to vacancies, free surfaces, and dislocations, indicate that our potentials are in excellent overall agreement with DFT calculations.

Original languageEnglish (US)
Article number174101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number17
DOIs
StatePublished - May 1 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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