Shrinking kinetics by vacancy diffusion of hollow binary alloy nanospheres driven by the Gibbs-Thomson effect
The general treatment of the Gibbs-Thomson effect for a hollow nanosphere is presented. It allows for a vacancy composition profile across the nanoshell to be defined by a continuously decreasing function as well as by a continuous function with a minimum. The range for the controlling parameter of...
Saved in:
Published in | Philosophical magazine (Abingdon, England) Vol. 88; no. 10; pp. 1525 - 1541 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Abingdon
Taylor & Francis Group
01.04.2008
Taylor and Francis |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The general treatment of the Gibbs-Thomson effect for a hollow nanosphere is presented. It allows for a vacancy composition profile across the nanoshell to be defined by a continuously decreasing function as well as by a continuous function with a minimum. The range for the controlling parameter of the vacancy motion within a binary alloy nanoshell is determined in terms of the phenomenological coefficients as well as the (measurable) tracer diffusion coefficients (
) of the atomic components. On the basis of a theoretical description and kinetic Monte Carlo simulations, it is demonstrated that for a hollow random binary alloy nanosphere with an equi-atomic (initially homogeneous) composition and neglecting the radial dependence of vacancy formation free energy, the controlling parameter of the shrinking rate in the limiting case
can be estimated with reasonable accuracy as the geometric mean of the tracer diffusion coefficients of the atomic components. |
---|---|
Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1478-6435 1478-6443 |
DOI: | 10.1080/14786430802213413 |