Phase behavior of Au and Pt surfaces

G. Grübel, D. Gibbs, D. M. Zehner, D. L. Abernathy, A. R. Sandy, S. G.J. Mochrie

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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 T Tm ≈ 0.88 there are reversible phase transformations to incommensurate, corrugated-hexagonal phases. Below T Tm ≈ 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.

Original languageEnglish
Pages (from-to)842-846
Number of pages5
JournalSurface Science
Volume287-288
Issue numberPART 2
DOIs
StatePublished - May 10 1993
Externally publishedYes

Funding

We thank G. Ownby for his assistanceW. ork performed at BNL is supported by the DOE (Do-ACO276CHOOOl6)a, t ORNL by the DMS, DOE (DE-ACO5-84OR21400w) ith MMES, Inc., and at MIT by the NSF (DMR-9119675).

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