Non-parabolic shift of phase boundaries on nanoscale in binary systems with restricted solubility: Theory and experiment

G. L. Katona, Z. Erdélyi, Ch Dietrich, F. Weigl, H. G. Boyen, B. Koslowski, P. Ziemann, D. L. Beke

Research output: Contribution to journalArticle

Abstract

Based on our recent works we will show that the interplay of the chemical effect (phase-separation tendency) and the diffusion asymmetry (composition dependence of diffusion coefficient) can lead to nonparabolic shift of the interface in phase separating binary systems. Computer simulations show that the diffusion asymmetry in phase separating system results in interface shift proportional to tkc where 0.25≤kc≤1 (k c=0.5 corresponds to parabolic shift obtained from Fick's laws) [3]. In an X-ray photoelectron spectroscopy (XPS) based experiment we managed to demonstrate that this deviation indeed exists (kc=0.63), using a thin Ni deposit on top of a Au(111) single crystal [4]. Furthermore in this paper we will show that the dissolution of a thin film into semi-infinite substrate usually consists of two processes: saturation of the surface with substrate atoms and the shift of the interface. A separation method of these processes is also presented.

Original languageEnglish
Pages (from-to)1216-1221
Number of pages6
JournalDefect and Diffusion Forum
Volume237-240
Issue numberPART 2
Publication statusPublished - Jan 1 2005

Keywords

  • Composition dependent diffusion coefficient
  • Nanoscale interface shift
  • Non-parabolic interface shift
  • Phase separating system
  • XPS

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

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    Katona, G. L., Erdélyi, Z., Dietrich, C., Weigl, F., Boyen, H. G., Koslowski, B., Ziemann, P., & Beke, D. L. (2005). Non-parabolic shift of phase boundaries on nanoscale in binary systems with restricted solubility: Theory and experiment. Defect and Diffusion Forum, 237-240(PART 2), 1216-1221.