Paper Title:
Interface Shape Change and Shift Kinetics on the Nanoscale
  Abstract

In nanostructured materials, where the density of grain- and interphase-boundaries is high, the diffusion and kinetics of surface segregation, i.e. the effective material flow is always influenced by the contributions of these boundaries [1]. Diffusion on the nano/atomic scales in multilayers, thin films has many challenging features even if the role of structural defects can be neglected and ‘only’ the effects related to the nano/atomic scale arise. Different examples for diffusional nanoscale effects discovered recently by the authors will be given in this paper. We show that the continuum descriptions of diffusion cannot be applied automatically on such short distances, the classical continuum approximations (Fick's laws) cannot describe correctly the atomic movements. [2-4] They predict faster kinetics than the atomistic models and the interface shift is always proportional to the square-root of time (x ∝ t1/2 ⇒ x2 ∝ t: parabolic or Fickian kinetics). As we will show, however, the kinetics can be even linear (x ∝ t) on the nano/atomic scale. [3, 4] Furthermore, the continuum descriptions foretell infinitely fast kinetics as the time goes to zero (v=dx/dt∝1/t1/2), which is a long standing paradox of diffusion theory. We will show a possible resolution of this paradox. [5] Moreover, we will show that an initially diffused interface can sharpen even in completely miscible systems. [6, 7]

  Info
Periodical
Solid State Phenomena (Volume 129)
Edited by
R. Kozubski, G.E. Murch and P. Zięba
Pages
105-110
DOI
10.4028/www.scientific.net/SSP.129.105
Citation
Z. Erdélyi, D. L. Beke, G.A. Langer, A. Csik, "Interface Shape Change and Shift Kinetics on the Nanoscale", Solid State Phenomena, Vol. 129, pp. 105-110, 2007
Online since
November 2007
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Price
$32.00
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