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- W2040466014 abstract "The surface composition and structure of a Ni-21Cr-8Fe (100) single crystal were studied by angle-resolved XPS, AES and LEED. A detailed calibration was done by XPS with the individual metals. The composition of the clean surface is identical to the composition of the bulk alloy and a (1 × 1) structure is observed. The surface segregation of sulphur during annealing sulphur-doped alloys in UHV was studied in the temperature range 600 to 850°C. At saturation a c(2 × 2) structure is observed by LEED. The segregation of sulphur induces a marked cosegregation of chromium: when the surface is covered by a complete monolayer of sulphur, the surface concentration of chromium is ~ 94%. The free enthalpy of surface segregation of sulphur (ΔHSseg) was derived from the plot of the surface coverage of sulphur versus temperature. A value ΔHSseg= −105 kJ mol−1 is obtained. The segregation kinetics (sulphur coverage versus time) were investigated at 550, 600, 620 and 750°C and a diffusion coefficient D = 0.1 exp(−175 × 103 [Jmol−1]/RT) cm2s−1 is derived from the experimental results. The adsorption of sulphur was studied by exposing the alloy surface to H2S-H2 gas mixtures of well controlled H2S partial pressure, at 970°C. The alloy surface is saturated by adsorbed sulphur in the range of p(H2S)/p(H2)= 7 × 10−5 to 1.8 × 10−4. The sulphur coverage, measured with radioactive sulphur ( 48(± 3) × 10−9gcm2, which corresponds to a ratio of sulphur atoms to metal atoms on the surface of 0.56. For partial pressures H2S above 1.8 × 10−4, the sulphidation of the alloy is observed, which indicates that the alloy does not behave as an ideal solid solution." @default.
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- W2040466014 date "1991-06-01" @default.
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- W2040466014 title "XPS study of the segregation of sulphur on Ni-21Cr-8Fe (100) alloy" @default.
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- W2040466014 doi "https://doi.org/10.1016/0039-6028(91)90842-g" @default.
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