Composition of a Clean and Sulphur Covered CuNi(100) Single Crystal Surface

• Authors: P.J. Godowski , P. Marcus
• Languages of publication: EN

Abstracts

EN

Surface composition of the CuNi(100) single crystal in the temperature range of 893÷1073 K (620÷800°C) has been investigated using low energy electron diffraction and Auger electron spectroscopy methods. A clean sam­ple surface at moderate temperatures reveals small surface copper enrich­ment, with respect to the bulk Cu-rich composition. For example, at 1006 K (733°C) the copper surface concentration C^{s}_{Cu}, was determined from the quantitative Auger electron spectroscopy analysis as 0.91. After prolonged heating at higher temperatures, the copper surface concentration converges to the bulk value, i.e. at 1073 K (800°C), C^{s}_{Cu} = C^{b}_{Cu} = 0.87. Surface seg­regation of sulphur proceeds from (1 × 1) through p(2 × 2)S/CuNi(100) to c(2 × 2)S/CuNi(100) structures of low energy electron diffraction. In the presence of segregated sulphur the surface concentration of copper is lower.

Keywords

EN

82.80.Pv; 61.14.Hg; 68.35.Dv

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 3
• Pages: 619-630

Dates

published

1995-03

received

1994-07-05

(unknown)

1994-09-13

(unknown)

1994-12-28

Contributors

author

P.J. Godowski

• Laboratoire de Physico-Chimie des Surfaces, CNRS (URA 425), Université Paris VI, ENSCP, 11, Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France

author

P. Marcus

• Laboratoire de Physico-Chimie des Surfaces, CNRS (URA 425), Université Paris VI, ENSCP, 11, Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France