Journal
ACTA MATERIALIA
Volume 59, Issue 1, Pages 61-67Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.09.001
Keywords
Bulk diffusion; Thermodynamics; Phase transformation kinetics; Oxidation; Stress formation in nanospheres
Funding
- Austrian Federal Government
- Styrian Provincial Government
- Czech Science Foundation [P108/10/1781]
- Research Plan of Institute of Physics of Materials [CEZ AV0Z20410507]
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The formation of stoichiometric MpXq hollow nanospheres by reaction of metallic M nanospheres with the gaseous X phase must be preceded by the formation of a sufficiently thick MpXq nanoshell on the metallic core of phase M During this stage, high supersaturation of vacancies in the M core and/or hydrostatic stress in the M core, due to the misfit between the core and the nanoshell, are developed and provide favourable conditions for the hollow nucleation The misfit is caused by the Kirkendall effect Based on the application of the thermodynamic extremal principle, a kinetic model of MpXq nanoshell formation is derived The kinetics is driven by the change of the chemical energy due to reaction of the M and X components, the interface and surface energies, and the elastic strain energy due to misfit strain of the whole system The model is used for simulation of the Cu2O shell growth kinetics due to oxidation of a Cu nanosphere, and the results of the simulations are discussed (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved
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