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

Authors

Ashwin Ramasubramaniam, University of Massachusetts - AmherstFollow
Emily Carter
Mitsuhiro Itakura

Publication Date

May 2009

Journal or Book Title

Physical Review B

Abstract

We present two interatomic potentials for hydrogen in α–iron based on the embedded atom method potentials for iron developed by Mendelev et al. Philos. Mag. 83 3977 (2003) and Ackland et al. 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.

Comments

Doi:10.1103/PhysRevB.79.174101 Copyright 2009 by the American Physical Society.

Volume

79

Issue

17

Recommended Citation

Ramasubramaniam, Ashwin; Carter, Emily; and Itakura, Mitsuhiro, "Interatomic potentials for hydrogen in a-iron based on density functional theory" (2009). Physical Review B. 610.
Retrieved from https://scholarworks.umass.edu/mie_faculty_pubs/610