Structure and phases of the Au(001) surface: In-plane structure

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.7330· OSTI ID:6182336

Gibbs, D; Ocko, B M ^[1]; Zehner, D M ^[2]; Mochrie, S G.J. ^[3]

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1. Physics Department, Brookhaven National Laboratory, Upton, NY (USA)
2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN (USA)
3. Physics Department, Massachusetts Institute of Technology, Cambridge, MA (USA) Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA (USA)

We present the results of an x-ray-scattering study of the structure and phases of the clean Au(001) surface between room temperature and the bulk melting temperature of 1337 K. These experiments were performed in the glancing-incidence geometry, using an ultrahigh-vacuum apparatus for x-ray surface scattering. Three distinct surface structural phases have been identified. In the high-temperature phase (1170{lt}{ital T}{lt}1337 K), the x-ray-diffraction pattern has the (1{times}1) symmetry of the bulk, consistent with a disordered surface layer. At about {ital T}=1170 K there is a reversible phase transition to an incommensurate, distorted-hexagonal structure. Below {ital T}=970 K the surface has a rotated, distorted-hexagonal structure in which both the incommensurability and the average rotation angle are weakly temperature dependent. In this phase the line shapes of the hexagonal diffraction peaks show hysteresis, and the length scale over which there exists in-plane order is reduced.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6182336
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:12; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
GOLD
HIGH TEMPERATURE
MEDIUM TEMPERATURE
MELTING POINTS
METALS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
X-RAY SPECTROSCOPY