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LEED‐AES investigation on the influence of thermally segregated chromium on the oxidation of an iron‐chromium alloy
Author(s) -
Müssig H.J.,
Allmer F.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200218
Subject(s) - chromium , auger electron spectroscopy , auger , alloy , adsorption , analytical chemistry (journal) , materials science , chemistry , metallurgy , atomic physics , physics , chromatography , nuclear physics
When heating a (111)‐oriented Fe 1‐ x Cr x single‐crystal sample (0.05 ≦ x ≦ 0.10) for 15 minutes at 550 °C an unarranged surface layer rich in chromium and nitrogen, simultaneously, with x = 0.40 will ermerge. The low‐energy Auger signals of iron and chromium were involved for characterizing the chemical bond and the high‐energy ones used for quantitative analysis. The shape and the energy position of the transitions were exactly determined by integration, background subtraction and approximate deconvolution of the Auger electron spectra measured differentiatedly. Chromium nitride layers were detected which retard probably the formation of the FeO layer compared to Leygraf et al. While the adsorption isotherm at room temperature for the surface poor in chromium and crystallographically perfect shows two erratic changes of the sticking probability, the adsorption isotherm for the surface rich in chromium is a continuous curve with a higher increase in the lower dose‐region typical for random surfaces.