Surface segregation of Au–Pd alloys in UHV and reactive environments: Quantification by a catalytic atom probe
The surface composition of an Au-62at% Pd alloy has been studied by means of a catalytic
atom probe (CAP) before and after exposures to nitric oxide (NO) at temperatures ranging
from 300 to 573K for 20min. Subsequent CAP analysis at 100K revealed a considerable
surface enrichment in Pd (to∼ 80at%) after exposure at 573K. This is correlated with the
occurrence of NO dissociation, and the formation of strong Pd–O bonds at the surface. Blank
experiments in ultra-high vacuum reflect the surface composition of the bulk material, in …
atom probe (CAP) before and after exposures to nitric oxide (NO) at temperatures ranging
from 300 to 573K for 20min. Subsequent CAP analysis at 100K revealed a considerable
surface enrichment in Pd (to∼ 80at%) after exposure at 573K. This is correlated with the
occurrence of NO dissociation, and the formation of strong Pd–O bonds at the surface. Blank
experiments in ultra-high vacuum reflect the surface composition of the bulk material, in …
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