Abstract
The oxidation of polycrystalline samples of Fe/Ni alloys at 500° C has been studied by means of Auger electron spectroscopy (AES) and soft X-ray appearance potential spectroscopy (APS). Whereas the clean surfaces are always enriched with nickel, oxidation of samples with less than about 70% Ni causes a complete segregation of iron oxide (Fe 3O 4). Alloys containing more than 70% Ni are covered after oxidation with a mixed oxide layer which is identified (in accordance with general experience) with a spinel structure. In the latter case the “chemical shift” of the binding energies of the Ni 2p-electrons decreases from 1.5 to 0.7 eV with decreasing Ni content whereas the corresponding quantities of Fe remain essentially constant over the whole range of concentrations.
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