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 language | English |
---|---|
Pages (from-to) | 842-846 |
Number of pages | 5 |
Journal | Surface Science |
Volume | 287-288 |
Issue number | PART 2 |
DOIs | |
State | Published - May 10 1993 |
Externally published | Yes |
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).