Surface segregation of nickel and antimony in Iron

Abstract

Segregation levels of Ni and Sb on the free surface of Fe have been measured for binary and ternary alloys of Fe-4 at.-%Ni-0.0087 at.-%Sb. Nickel segregates at all temperatures in the binary and ternary alloys with a free energy of segregation ∆G = −15.5 kJ mol⁻¹. Antimony segregates in the binary and ternary alloys to equilibrium coverages of 1 < θ < 2 monolayers. There is no observed increase in the surface coverage of Ni due to the presence of segregated Sb at temperatures above 920 K.