Quantitative parameter-free prediction of simulated crystal-nucleation times.
Phys Rev Lett
; 96(24): 245701, 2006 Jun 23.
Article
de En
| MEDLINE
| ID: mdl-16907254
ABSTRACT
We present direct comparisons between simulated crystal-nucleation times and theoretical predictions using a model of aluminum, and demonstrate that a quantitative prediction can be made. All relevant thermodynamic properties of the system are known, making the agreement of our simulation data with nucleation theories free of any adjustable parameters. The role of transient nucleation is included in the classical nucleation theory approach, and shown to be necessary to understand the observed nucleation times. The calculations provide an explanation on why nucleation is difficult to observe in simulations at moderate undercoolings. Even when the simulations are significantly larger than the critical nucleus, and when simulation times are sufficiently long, at moderate undercoolings the small concentration of critical nuclei makes the probability of the nucleation low in molecular dynamics simulations.
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Collection:
01-internacional
Base de données:
MEDLINE
Type d'étude:
Prognostic_studies
/
Risk_factors_studies
Langue:
En
Journal:
Phys Rev Lett
Année:
2006
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique