× Updated! Potentials that share interactions are now listed as related models.
Citation: E. Lee, K.-R. Lee, M.I. Baskes, and B.-J. Lee (2016), "A modified embedded-atom method interatomic potential for ionic systems: 2NNMEAM+Qeq", Physical Review B, 93(14), 144110. DOI: 10.1103/physrevb.93.144110.
Abstract: An interatomic potential model that can simultaneously describe metallic, covalent, and ionic bonding is suggested by combining the second nearest-neighbor modified embedded-atom method (2NNMEAM) and the charge equilibration (Qeq) method, as a further improvement of a series of existing models. Paying special attention to the removal of known problems found in the original Qeq model, a mathematical form for the atomic energy is newly developed, and carefully selected computational techniques are adapted for energy minimization, summation of Coulomb interaction, and charge representation. The model is applied to the Ti-O and Si-O binary systems selected as representative oxide systems for a metallic element and a covalent element. The reliability of the present 2NNMEAM+Qeq potential is evaluated by calculating the fundamental physical properties of a wide range of titanium and silicon oxides and comparing them with experimental data, density functional theory calculations, and other calculations based on (semi-)empirical potential models.

hybrid/overlay coul/streitz meam (2016--Lee-E--Ti-O--LAMMPS--ipr1)
See Computed Properties
Notes: These files were obtained from http://cmse.postech.ac.kr/home_2nnmeam, accessed Nov 9, 2020.More information on using the 2NNMEAM-QEQ potentials can be found at https://cmse.postech.ac.kr/lammps/140341.
Citation: P. Zhang, and D.R. Trinkle (2016), "A modified embedded atom method potential for interstitial oxygen in titanium", Computational Materials Science, 124, 204-210. DOI: 10.1016/j.commatsci.2016.07.039.
Abstract: Modeling oxygen interstitials in titanium requires a new empirical potential. We optimize potential parameters using a fitting database of first-principle oxygen interstitial energies and forces. A new database optimization algorithm based on Bayesian sampling is applied to obtain an optimal potential for a specific testing set of density functional data. A parallel genetic algorithm minimizes the sum of logistic function evaluations of the testing set predictions. We test the transferability of the potential model against oxygen interstitials in HCP titanium, transition barriers between oxygen interstitial sites, and oxygen in the titanium prismatic stacking fault. The potential predicts that the interaction between oxygen and a screw dislocation core is weak and short-ranged.

Notes: Prof. Trinkle said that this potential is specifically intended for dilute oxygen in titanium as there's no oxygen-oxygen interaction. 9 Aug. 2016: the reference information was updated.

MEAM splines (2016--Zhang-P--Ti-O--table--ipr1)
Notes: This file was sent by Prof. Dallas Trinkle (Univ. of Illinois) on 6 Aug. 2016 and posted with his permission. Update 2018-11-06: file format changed to reflect that it does not work with LAMMPS.
File(s): superseded

MEAM splines (2016--Zhang-P--Ti-O--table--ipr2)
Notes: This file was sent by Prof. Dallas Trinkle (Univ. of Illinois) on 9 Aug. 2016 and posted with his permission. This version removes an extra comment line that was not compatible with the LAMMPS MEAM/spline code. Update 2018-11-06: file format changed to reflect that it does not work with LAMMPS (see version below).
File(s): superseded

LAMMPS pair_style meam/spline (2016--Zhang-P--Ti-O--LAMMPS--ipr1)
See Computed Properties
Notes: This file was taken from the August 22, 2018 LAMMPS distribution. It has a slightly different header section from the above versions allowing it to work in the official multi-element meam/spline implementation. This version successfully ran with the stable March 16, 2018 and August 22, 2018 LAMMPS versions.
Date Created: October 5, 2010 | Last updated: June 09, 2022