Abstract
AES and LEED have been applied to the investigation of segregation phenomena on (100) oriented surfaces of Fe15%Cr single crystals with different nitrogen, carbon and sulphur contents at elevated temperatures. At temperatures below 750°C an epitaxially stabilized surface chromium nitride with (1 × 1) orientation and a corresponding chromium carbide are formed by simultaneous segregation of the constituent components on nitrogen and carbon containing samples, respectively. Both surface compounds are classified as two-dimensional, interstitial compounds: their atomic arrangements are related to the (100) planes of the well-known bulk CrN and of a hypothetical bulk CrC with rocksalt structure. Above 750°C the formation of a c(2 x̧ 2) S structure has been observed on the surface of sulphur containing Fe15%Cr single crystals. The simultaneous chromium enrichment indicates preferential interactions between sulphur and chromium.
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