Abstract
Abstract Pd segregates to a large extent to the surface of a Pd1Fe99 alloy stabilized at 870 K. The outer layer composition contains as much as 55 ± 5 at% Pd as deduced from LEIS data. Complementary XPS measurements performed at various exit angles with respect to the surface indicated that the Pd enrichment extends to more than one layer below the very surface. A calculation of the segregation free enthalpy based on the broken bond model using macroscopic thermodynamic data, allows us to describe the concentration equilibrium between the first and second layers well.
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