Reconstructions of Au films on Pd(110)

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.8834· OSTI ID:5693867

Schmitz, P J; Leung, W; Kang, H C; Thiel, P A ^[1]

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1. Department of Chemistry, Iowa State University, Ames, Iowa 5011 (USA) Ames Laboratory, Iowa State University, Ames, Iowa 50011 (US)

We present a study of thermally activated changes in Au films, 1--10 monolayers thick, on Pd(110). The films are stable against bulk dissolution until {similar to}500 K, based upon Auger electron spectroscopy. For Au coverages below 1.5 monolayers, only a (1{times}1) overlayer structure is observed with low-energy electron diffraction over the entire temperature range studied (130--800 K). At coverages above 1.0 monolayers and after annealing to temperatures above 300 K, a (1{times}{ital z}) diffraction pattern develops. With increasing coverage the value of {ital z} increases continuously from 2 to 3, reaching {ital z}=3 at 4 monolayers. We propose that the diffraction pattern reflects a coverage-dependent mixture of small domains of (1{times}2) and (1{times}3) reconstruction, with the (1{times}2) favored at low coverage and the (1{times}3) favored at high coverage. This model is rationalized in terms of the film's coverage-dependent morphology, which can be described as Stranski-Krastanov with a critical thickness of 2 monolayers.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5693867
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Journal Issue: 11 Vol. 43:11; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ANNEALING
CRITICAL SIZE
CRYSTAL FACES
ELEMENTS
FILMS
GOLD
HEAT TREATMENTS
IRREVERSIBLE PROCESSES
METALS
PALLADIUM
PLATINUM METALS
SIZE
SUBSTRATES
TEMPERATURE EFFECTS
TRANSITION ELEMENTS