Abstract
The surface composition and structure of NiAl(001) has been investigated by 180°-neutral impact collision ion scattering spectroscopy (NICISS) and high resolution spot profile analysis of low energy electron diffraction (SPA-LEED). Long time annealing below 500 K results in a p(1 × 1) LEED pattern. The surface can be described by a defect enriched Al terminated surface. Another p(1 × 1) LEED pattern appears after flashed annealing at 1400 K and rapid cooling at room temperature. The high temperature p(1 × 1) phase is however nearly perfectly Ni terminated. It has been found that the formation of the high temperature NiAl(001)-p(1 × 1) phase is closely related to roughening of the topmost Al layer by vacancy creation at high annealing temperatures. In the intermediate annealing temperature range about 800 K surface roughening results in an Al terminated missing row surface structure exposing a c(√2 × 3√2)R45° LEED superstructure.
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