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Title: Phase-field crystal modeling of heteroepitaxy and exotic modes of crystal nucleation
Authors: Podmaniczky, Frigyes
Toth, Gyula I.
Tegze, Gyorgy
Pusztai, Tamas
Granasy, Laszlo
Keywords: Solidification
Heterogeneous nucleation
Heteroepitaxy
Growth front nucleation
Phase-field crystal model
Hydrodynamic theory of crystallization
Issue Date: 2017
Publisher: © Elsevier
Citation: PODMANICZKY, F. ...et al., 2017. Phase-field crystal modeling of heteroepitaxy and exotic modes of crystal nucleation. Journal of Crystal Growth, 457, pp. 24-31.
Abstract: We review recent advances made in modeling heteroepitaxy, two-step nucleation, and nucleation at the growth front within the framework of a simple dynamical density functional theory, the Phase-Field Crystal (PFC) model. The crystalline substrate is rep-resented by spatially confined periodic potentials. We investigate the misfit dependence of the critical thickness in the Stranski–Krastanov growth mode in isothermal studies. Apparently, the simulation results for stress release via the misfit dislocations fit better to the People–Bean model than to the one by Matthews and Blakeslee. Next, we investigate structural aspects of two-step crystal nucleation at high undercoolings, where an amorphous precursor forms in the first stage. Finally, we present results for the formation of new grains at the solid-liquid interface at high supersaturations / supercoolings, a phenomenon termed Growth Front Nucleation (GFN). Results obtained with diffusive dynamics (applicable to colloids) and with a hydrodynamic extension of the PFC theory (HPFC, developed for simple liquids) will be compared. The HPFC simulations indicate two possible mechanisms for GFN.
Description: This paper was accepted for publication in the journal Journal of Crystal Growth and the definitive published version is available at https://doi.org/10.1016/j.jcrysgro.2016.06.056
Sponsor: This work has been supported by National Agency for Re-search, Development, and Innovation (NKFIH), Hungary un-der contract No. OTKA-K-115959, by the EU FP7 Collabora-tive Project “EXOMET” (contract no. NMP-LA-2012-280421, co-funded by ESA), and by the ESA MAP/PECS projects “MAGNEPHAS III” (ESTEC Contract No. 40000110756/11/ NL/KML) and “GRADECET” (ESTEC Contract No. 40000 110759/11/ NL/KML).
Version: Accepted for publication
DOI: 10.1016/j.jcrysgro.2016.06.056
URI: https://dspace.lboro.ac.uk/2134/27267
Publisher Link: https://doi.org/10.1016/j.jcrysgro.2016.06.056
ISSN: 0022-0248
Appears in Collections:Published Articles (Maths)

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