Oxygen adsorption behavior on the surface of liquid Cu-Ag alloys

Joonho Lee, Toshihiro Tanaka, Yuuichi Asano, Shigeta Hara

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The behavior of oxygen adsorption on the surface of liquid Cu-Ag alloys was investigated by measuring their surface tension (σ) with the sessile drop method in the oxygen partial pressures (pO2,) between 2.5 × 10-11 and 2.5 × 10-3 Pa. The oxygen adsorption (the surface excess concentration of oxygen) was calculated from the slope of dσ/d ln pO2 by applying Gibbs adsorption isotherm, for liquid Cu, Cu-5 at%Ag, Cu-10at%Ag, Cu-20at%Ag and Ag. It was found that the oxygen adsorption increased with the oxygen partial pressure, up to saturation on the surface. The oxygen adsorption on the surface of liquid Cu-20 at%Ag alloys exhibited almost the same behavior as that of pure liquid Ag, because surface saturation was not achieved for the Cu-20 at%Ag alloys, even at high oxygen partial pressures. Thermodynamic calculations using Butler's model indicated that the mole fraction of Ag in the surface of liquid Cu-Ag alloys drastically increases to 0.81 when the mole fraction of Ag in the bulk is only 0.2. Thus, it is considered that the outermost surface of liquid Cu-20 at% Ag alloys contains an enhanced level of Ag, which determines the oxygen adsorption behavior on liquid Cu-20 at%Ag alloys.

Original languageEnglish
Pages (from-to)2719-2722
Number of pages4
JournalMaterials Transactions
Volume45
Issue number8
DOIs
Publication statusPublished - 2004 Aug
Externally publishedYes

Keywords

  • Adsorption
  • Metals and alloys
  • Oxygen
  • Sessile drop method
  • Surface tension
  • Surfaces

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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