Stress Development During Reaction of Metallic Nanospheres with Gas

0363673 - ÚFM 2012 RIV GB eng J - Journal Article
Svoboda, Jiří - Fischer, F. D.
Stress Development During Reaction of Metallic Nanospheres with Gas.
Acta Materialia. Roč. 59, č. 1 (2011), s. 61-67. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA ČR GAP108/10/1781
Institutional research plan: CEZ:AV0Z20410507
Keywords : Bulk diffusion * Phase transformation kinetics * Oxidation
Subject RIV: BJ - Thermodynamics
Impact factor: 3.755, year: 2011

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 thickMpXq 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.
Permanent Link: http://hdl.handle.net/11104/0199395