Shrinking kinetics by vacancy diffusion of hollow binary alloy nanospheres driven by the Gibbs-Thomson effect

被引：12

作者：

Evteev, A. V. ^{[1
]}

Levchenko, E. V. ^{[1
]}

Belova, I. V. ^{[1
]}

Murch, G. E. ^{[1
]}

机构：

[1] Univ Newcastle, Univ Ctr Mass & Thermal Transport Engn Mat, Sch Engn, Callaghan, NSW 2308, Australia

来源：

PHILOSOPHICAL MAGAZINE | 2008年 / 88卷 / 10期

基金：

澳大利亚研究理事会;

关键词：

diffusion; stability; vacancies; Monte Carlo; binary alloys; hollow nanospheres;

D O I：

10.1080/14786430802213413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 ail 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.

引用

页码：1525 / 1541

页数：17

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