Abstract
Based on previous photoemission findings, the influence of newly observed aluminum surface segregation at the low (110), (100) and (111) index surfaces of the A2 body-centered Fe0.85Al0.15 random alloy is explored. Scanning Tunneling Microscopy, Low-Energy Electron Diffraction and Grazing-Incidence X-ray Diffraction are combined to explore surface structures and topographies. The formation of a surface composition close to the B2Fe0.5Al0.5 occurs with the appearance of (i) a long-range pseudo-hexagonal incommensurate superstructure with a periodicity of ~18 Å on the (110) surface, (ii) a (1×1) termination on the (100) surface and (iii) a intense vicinal faceting of the (111) surface in the form of triangular pits.
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