Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/41490

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Title
Shrinking kinetics by vacancy diffusion of hollow binary alloy nanospheres driven by the Gibbs-Thomson effect
Author/Creator
Evteev, A. V.;  Levchenko, E. V.;  Belova, I. V.;  Murch, G. E.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
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 (D*A,D*B) 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 D*A ≫ D*B can be estimated with reasonable accuracy as the geometric mean of the tracer diffusion coefficients of the atomic components.
Relation
Philosophical Magazine Vol. 88, Issue 10, p. 1525-1541
Publisher Link
http://dx.doi.org/10.1080/14786430802213413
Date
2008
Publisher
Taylor & Francis
Keyword(s)
diffusion;  stability;  vacancies;  Monte Carlo;  binary alloy;  hollow nanospheres
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/41490
Identifier
ISSN:1478-6435
Reviewed
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"Philosophical Magazine"
 
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