Abstract
2014 Surface segregation with the disproportionation into La and Th oxide plus precipitations of elemental Ni play an important role in the understanding of the easy hydrogen absorption of LaNi5 and of the catalytic properties of ThNi5. By means of core-level X-ray photoelectron spectroscopy we show that the chemisorption of O2, H2O, and H2 on LaNi5 surfaces induces a strong, weak and no surface segregation, resp. Precoverage with SO2 blocks further segregation, whereas exposure to H2S does not. The oxygen induced segregation of ThNi5 at room temperature is much weaker than in LaNi5, but is very extensive at 200 °C. J. Physique 42 (1981) 1025-1028 JUILLET 1981,
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