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Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 9: Adsorption an Oberflächen (II)

O 9.5: Talk

Monday, March 27, 2000, 17:15–17:30, H37

Surface cosegregation of chromium and sulphur in single crystalline austenitic Fe-Ni-Cr alloys — •Christian Uebing1, Jozef Janovec2, Andrea Dziakova1, and Elke Clauberg11Max-Planck-Institut f"ur Eisenforschung, D"usseldorf — 2Institute of Materials Research, Slovak Academy of Sciences, Kosice, Slovak Republic

In the present work we have studied cosegregation of sulphur and

chromium on well-defined austenitic Fe-Cr-Ni alloy surfaces. For this purpose we have investigated (100) oriented surfaces of

Fe-14.8%Cr-17.8%Ni (cS = 9 wt-ppm) and

Fe-18%Cr-14%Ni (cS = 18 wt-ppm) single crystals using Auger electron spectroscopy (AES) and low energy electron diffraction (LEED). Segregation experiments were carried out under UHV conditions at temperatures ranging from 500 to 900C. Cosegregation of chromium and sulphur is well pronounced on the Fe-14.8%Cr-17.8%Ni(100) alloy surface, while on Fe-18%Cr-14%Ni(100) the surface concentration

of cosegregated chromium is rather small. On both surfaces sulphur segregation is characterized by a 2x2 LEED pattern. The results of the present study are compared with a previous study using ferritic Fe-15%Cr-S(100) alloy single crystals.

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