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Sintering of Metal(100) Homoepitaxial Islands: Kink Rounding Barriers, Modified Size Scaling, and Experimental Behavior

Published online by Cambridge University Press:  11 February 2011

Da-Jiang Liu ,
C. R. Stoldt ,
P. A. Thiel  and
J. W. Evans
Da-Jiang Liu
Affiliation:
Ames Laboratory – USDOE, Iowa State University, Ames, Iowa 50011
C. R. Stoldt*
Affiliation:
Department of Chemistry, Iowa State University, Ames, Iowa 50011
P. A. Thiel
Affiliation:
Ames Laboratory – USDOE, Iowa State University, Ames, Iowa 50011 Department of Chemistry, Iowa State University, Ames, Iowa 50011
J. W. Evans
Affiliation:
Ames Laboratory – USDOE, Iowa State University, Ames, Iowa 50011 Department of Mathematics, Iowa State University, Ames, Iowa 50011
*
* Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309
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Abstract

Near-square islands form during sub-monolayer homoepitaxial growth on metal (100) surfaces. Diffusion of these islands after deposition leads to collision of island pairs, typically corner-to-corner creating dumbbell-shaped clusters. Subsequent coalescence (or sintering) recovers a near-square equilibrium shape. This process is mediated by periphery diffusion (PD) and its study can provide detailed insight into the underlying dynamic processes and energetics. Atomistic modeling reveals that the size scaling of the characteristic relaxation time, τ, depends on the detailed energy barriers of various hopping processes that contribute to PD. Simulations without an extra kink or corner rounding barrier for PD reveals τ ∼ L4, while behavior approaching τ ∼ L3 is observed with a significant extra kink rounding barrier for PD. The latter is consistent with experimental observations for Ag/Ag(100) at 300 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 749: Symposium W – Morphological and Compositional Evolution of Thin Films , 2002 , W2.8
Copyright
Copyright © Materials Research Society 2003

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References

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