A model of oxygen adsorption at liquid copper surfaces

SURFACE SCIENCE

卷:604

Article

Wynblatt, P.²  Curiotto, S.¹  Chatain, D.¹ 

[1] Aix Marseille Univ, CNRS, CINAM UPR3118, F-13288 Marseille, France

[2] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15206 USA

关键词: Surface energy;    Equilibrium thermodynamics;    Surface segregation;    Liquid copper-oxygen surfaces;   

DOI  :  10.1016/j.susc.2010.04.015

来源: Elsevier

【 摘 要 】

A model of O-adsorption at liquid metal surfaces has been constructed, using liquid Cu as an example. The modeling approach used is similar to the regular solution scheme previously used successfully for modeling the adsorption/segregation behavior of metal alloys, in that the internal energy of the system is evaluated by nearest neighbor bond energies. In the model, the adsorption of oxygen in the near-surface region is allowed to occur at both surface and sub-surface sites. The model predicts a variety of possible adsorption characteristics, including the possibility of first order adsorption transitions which involve the formation of a 2-dimensional surface oxide, and different sequences for the occupancy of surface and sub-surface adsorption sites. In particular, by fitting the model to the experimental dependence of Cu surface energy on O-partial pressure, it is possible to conclude that O-adsorption in that case most likely occurs by the occupancy of sub-surface sites. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free