The surface structure of alpha-Al{sub 2}O{sub 3} determined by low-energy electron diffraction: Aluminum termination and evidence for anomalously large thermal vibrations

Journal Article · Wed Jul 19 00:00:00 EDT 2000 · Surface Science

DOI:https://doi.org/10.1016/S0039-6028(00)00687-7· OSTI ID:792983

Walters, C F ^[1]; McCarty, K F; Soares, E A; Van Hove, M A

---

1. LBNL Library

The temperature dependence of the first three interlayer distances of the Ag(111) surface was studied by low-energy electron diffraction (LEED) over the temperature range 128K to 723 K. The first three interlayer spacings and the effective Debye temperatures were extracted from the LEED analysis. At the lowest temperature, the first two interlayer spacings are slightly (0.5 percent) contracted. All three interlayer spacings increase with temperature, finally reaching expansions relative to the bulk of about 0.8 percent at the highest temperature studied. The effective surface Debye temperature is lowest for the outermost layer, increasing toward the bulk value for successive layers.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 792983
• Report Number(s): LBNL--49720
• Journal Information: Surface Science, Journal Name: Surface Science Journal Issue: 2-3 Vol. 464; ISSN SUSCAS; ISSN 0039-6028
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
DEBYE TEMPERATURE
ELECTRON DIFFRACTION
LEED THERMAL EXPANSION AG(111)
TEMPERATURE DEPENDENCE