Elsevier

Surface Science

Volumes 287–288, Part 2, 10 May 1993, Pages 842-846
Surface Science

Phase behavior of Au and Pt surfaces

https://doi.org/10.1016/0039-6028(93)91084-3Get rights and content

Abstract

We summarize the results of X-ray scattering studies of the Au(001) and Pt(001) surfaces between 300 K and their respective bulk melting temperatures (Tm). Both surfaces exhibit three distinct structural phases. At high temperatures (0.88Tm < T < Tm) both surfaces are disordered. The Pt(001) surface is rough. At a temperature of TTm ≈ 0.88 there are reversible phase transformations to incommensurate, corrugated-hexagonal phases. Below TTm ≈ 0.8 hexagonal domains rotate with respect to the substrate orientation. In Pt, the rotational transformation is continuous and shows mean-field behavior. In Au, the rotational transformation is mainly discontinuous.

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