Atomic structure of a {001} surface ofNi3Al

Abstract

A low-energy electron diffraction intensity analysis of a clean ${\mathrm{Ni}}_3$Al{001} surface confirms the mixed-layer (50% Ni–50% Al) termination of this surface and reveals a small contraction of 2.8% of the first interlayer spacing (bulk value 1.78 Å), with the Al atoms slightly farther out (0.02±0.03 Å) than the Ni atoms, while the second interlayer spacing is bulklike.