Clustering on Magnesium Surfaces – Formation and Diffusion Energies
Abstract
The formation and diffusion energies of atomic clusters on Mg surfaces determine the surface roughness and formation of faulted structure, which in turn affect the mechanical deformation of Mg. This paper reports first principles density function theory (DFT) based quantum mechanics calculation results of atomic clustering on the low energy surfaces {0001} and {$$\bar{1}$$011} . In parallel, molecular statics calculations serve to test the validity of two interatomic potentials and to extend the scope of the DFT studies. On a {0001} surface, a compact cluster consisting of few than three atoms energetically prefers a face-centered-cubic stacking, to serve as a nucleus of stacking fault. On a {$$\bar{1}$$011} , clusters of any size always prefer hexagonal-close-packed stacking. Adatom diffusion on surface {$$\bar{1}$$011} is high anisotropic while isotropic on surface (0001). Three-dimensional Ehrlich–Schwoebel barriers converge as the step height is three atomic layers or thicker. FInally, adatom diffusion along steps is via hopping mechanism, and that down steps is via exchange mechanism.
- Authors:
-
[3]
- Shanghai Univ., Shanghai (China)
- Northeastern Univ., Boston, MA (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
- Publication Date:
- Research Org.:
- Northeastern Univ., Boston, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1393493
- Grant/Contract Number:
- SC0014035
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 74 ATOMIC AND MOLECULAR PHYSICS; Atomistic models; Surfaces; interfaces and thin films
Citation Formats
Chu, Haijian, Huang, Hanchen, and Wang, Jian. Clustering on Magnesium Surfaces – Formation and Diffusion Energies. United States: N. p., 2017.
Web. doi:10.1038/s41598-017-05366-1.
Chu, Haijian, Huang, Hanchen, & Wang, Jian. Clustering on Magnesium Surfaces – Formation and Diffusion Energies. United States. https://doi.org/10.1038/s41598-017-05366-1
Chu, Haijian, Huang, Hanchen, and Wang, Jian. Wed .
"Clustering on Magnesium Surfaces – Formation and Diffusion Energies". United States. https://doi.org/10.1038/s41598-017-05366-1. https://www.osti.gov/servlets/purl/1393493.
@article{osti_1393493,
title = {Clustering on Magnesium Surfaces – Formation and Diffusion Energies},
author = {Chu, Haijian and Huang, Hanchen and Wang, Jian},
abstractNote = {The formation and diffusion energies of atomic clusters on Mg surfaces determine the surface roughness and formation of faulted structure, which in turn affect the mechanical deformation of Mg. This paper reports first principles density function theory (DFT) based quantum mechanics calculation results of atomic clustering on the low energy surfaces {0001} and {$\bar{1}$011} . In parallel, molecular statics calculations serve to test the validity of two interatomic potentials and to extend the scope of the DFT studies. On a {0001} surface, a compact cluster consisting of few than three atoms energetically prefers a face-centered-cubic stacking, to serve as a nucleus of stacking fault. On a {$\bar{1}$011} , clusters of any size always prefer hexagonal-close-packed stacking. Adatom diffusion on surface {$\bar{1}$011} is high anisotropic while isotropic on surface (0001). Three-dimensional Ehrlich–Schwoebel barriers converge as the step height is three atomic layers or thicker. FInally, adatom diffusion along steps is via hopping mechanism, and that down steps is via exchange mechanism.},
doi = {10.1038/s41598-017-05366-1},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {Wed Jul 12 00:00:00 EDT 2017},
month = {Wed Jul 12 00:00:00 EDT 2017}
}
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