Table of Contents
Journal of Metallurgy
Volume 2011, Article ID 861373, 11 pages
Research Article

Tracer Diffusion Mechanism in Amorphous Solids

Department of Computational Physics, Hanoi University of Technology, 1 Dai Co Viet, Hanoi, Vietnam

Received 14 September 2010; Accepted 26 October 2010

Academic Editor: Sunghak I. Lee

Copyright © 2011 P. K. Hung et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Tracer diffusion in amorphous solid is studied by mean of -bubble statistic. The -bubble is defined as a group of atoms around a spherical void and large bubble that represents a structural defect which could be eliminated under thermal annealing. It was found that amorphous alloys such as (, 81.5 and 70) and suffer from a large number of vacancy bubbles which function like diffusion vehicle. The concentration of vacancy bubble weakly depends on temperature, but essentially on the relaxation degree of considered sample. The diffusion coefficient estimated for proposed mechanism via vacancy bubbles is in a reasonable agreement with experiment for actual amorphous alloys. The relaxation effect for tracer diffusion in amorphous alloys is interpreted by the elimination of vacancy bubbles under thermal annealing.