Reliability of methods of computer simulation of structure of amorphous alloys

TitleReliability of methods of computer simulation of structure of amorphous alloys
Publication TypeJournal Article
Year of Publication2010
AuthorsMendeleva MI, Kramer MJ
Journal TitleJournal of Applied Physics
Volume107
Pages073505
Date Published04/01
ISBN Number0021-8979
Accession NumberISI:000276795400019
KeywordsCU, interatomic potentials, liquid, molecular-dynamics, REVERSE MONTE-CARLO, rmc, solids
Abstract

We took a model created by the molecular dynamics (MD) simulation with a semiempirical potential as a target system and explored how its amorphous structure and a few other properties depend on the simulation method. We found that if the cooling rate is too high, 10(13)-10(14) K/s, the system has no time to adjust its structure to the change in temperature/density. Since this cooling corresponds to a typical ab initio MD simulation, this brings into doubt that an equilibrium glass structure can be obtained using ab initio MD simulation. We also used the target partial pair correlation functions (PPCFs) to explore a possibility to create the atomic models from diffraction data alone. We were able to create models with the PPCFs, which nearly coincided with the target ones. Nevertheless, we found that the potential energy of the quenched states and the distribution of the Voronoi polyhedra in the models created from PPCFs were different than the target quantities. This study shows that reverse Monte Carlo technique used to analyze the diffraction data can result in a considerably more disordered structure than the target structure. c 2010 American Institute of Physics. [doi: 10.1063/1.3359710]

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