Relaxation and diffusion barriers at step edges of Cu, Ag and Au homo- and heterogeneous systems: Case of (100) facet

2016 ◽  
Vol 107 (6) ◽  
pp. 518-524 ◽  
Author(s):  
Mourad Benlattar ◽  
Elyakout Elkoraychy ◽  
Khalid Sbiaai ◽  
M'hammed Mazroui ◽  
Yahia Boughaleb ◽  
...  
Keyword(s):  
Heterogeneous Systems ◽  
Diffusion Barriers ◽  
And Diffusion ◽  
Step Edges

The Ehrlich-Schwoebel Effect for Vacancies: Low-Index Faces of Silver

2000 ◽  
Vol 648 ◽  
Author(s):  
Michael I. Haftel
Keyword(s):  
Diffusion Barrier ◽  
Activation Barrier ◽  
Diffusion Barriers ◽  
Step Edge ◽  
Embedded Atom Method ◽  
Vacancy Diffusion ◽  
Exchange Diffusion ◽  
Embedded Atom ◽  
And Diffusion ◽  
Step Edges

AbstractWe employ surface-embedded-atom-method potentials to investigate the diffusion barriers of vacancies diffusing over and near steps on the low index faces of silver. Barriers for vacancy terrace diffusion, diffusion over step-edges, and diffusion along step edges, including around corners, are calculated. Vacancies are significantly less mobile than adatoms and have large Ehrlich-Schwoebel (ES) barriers on all three faces. For Ag(100) the diffusion barrier for vacancies along step-edges is virtually the same (474 meV) as on the terrace. As in diffusion near the step edge, vacancies encounter a significant increase (213 meV) in the activation barrier when diffusing around the corner of a vacancy island (the corner analogue of the ES barrier), but the excess barrier around a kink all but disappears because exchange diffusion is favorable there. The consequences of the vacancy diffusion barriers on 3D pitting and on island diffusion and coarsening are discussed.

Adsorption and Diffusion of Aluminum, Gallium and Indium Atoms on Semi-Polar Gallium Nitride Substrate Surface: A First Principle Simulation

2014 ◽  
Vol 1015 ◽  
pp. 598-601
Author(s):  
Han Yan ◽  
Pei Wang
Keyword(s):  
Molecular Dynamics ◽  
Gallium Nitride ◽  
Adsorption Energy ◽  
First Principles ◽  
Substrate Surface ◽  
Diffusion Barriers ◽  
First Principle ◽  
Barrier Energy ◽  
Calculation Results ◽  
And Diffusion

The first principles simulations are performed to investigate the adsorption and diffusion of aluminum, gallium and indium atoms on semi-polar gallium nitrides surface, the calculations are performed by using the Car–Parrinello molecular dynamics (CPMD) method. The aluminum ad-atoms adsorption in path 1 and path 3 are much stable than in path 2. The maximum adsorption energy of path1, path2 and path3 are different, which reveal that a different barrier energy pathway between indium ad-atom diffuse along path 1, path2 and path3. Our calculation results reveal that diffusion barriers of aluminum, gallium and indium atoms on semi-polar gallium nitride surface are anisotropy.

scholarly journals Active Transport and Diffusion Barriers Restrict Joubert Syndrome-Associated ARL13B/ARL-13 to an Inv-like Ciliary Membrane Subdomain

PLoS Genetics ◽  
2013 ◽  
Vol 9 (12) ◽  
pp. e1003977 ◽  
Author(s):  
Sebiha Cevik ◽  
Anna A. W. M. Sanders ◽  
Erwin Van Wijk ◽  
Karsten Boldt ◽  
Lara Clarke ◽  
...  
Keyword(s):  
Active Transport ◽  
Joubert Syndrome ◽  
Diffusion Barriers ◽  
Ciliary Membrane ◽  
Transport And Diffusion ◽  
And Diffusion

Interstitial total energies and diffusion barriers in Hg1−xCdxTe

1989 ◽  
Vol 7 (2) ◽  
pp. 354-359 ◽  
Author(s):  
C. G. Morgan‐Pond ◽  
J. T. Schick ◽  
S. Goettig
Keyword(s):  
Diffusion Barriers ◽  
Total Energies ◽  
And Diffusion

AB Initio Study of the Ge Adsorption and Diffusion on Si (100) Surface

1993 ◽  
Vol 317 ◽  
Author(s):  
V. Milman ◽  
S.J. Pennycook ◽  
D.E. Jesson ◽  
M.C. Payne ◽  
I. Stich
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Total Energy ◽  
Ab Initio ◽  
Binding Sites ◽  
Diffusion Barriers ◽  
Scanning Tunneling ◽  
Ab Initio Study ◽  
Tunneling Microscopy ◽  
And Migration ◽  
And Diffusion

ABSTRACTWe identify the binding sites for adsorption of a single Ge atom on the Si (100) surface using ab initio total energy calculations. The calculated diffusion barriers are in excellent agreement with experimental estimates. Using a large supercell we resolve the controversy regarding the binding geometry and migration path for the adatom, and investigate the influence of the adatom on the buckling of Si dimers. The adatom induces a buckling defect that is frequently observed using scanning tunneling Microscopy (STM); therefore the study of single adatoms may be experimentally accessible.

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