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Title: The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations

Abstract

We have determined the surface structure of alpha-Al2O3(0001) using dynamical low-energy electron diffraction (LEED). Sapphire surfaces were prepared in three different ways, and the diffraction results were analyzed using an exhaustive search of possible models. For all sample processing conditions, the clearly favored structure has a single Al layer termination and a large first interlayer contraction. In addition, we find that the surface atoms have unusually large vibrational amplitudes at room temperature, suggestive of an anharmonic vibrational mode.

Authors:
; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Sciences Division; National Counsel of Technologicaland Scientific Development/Brazil
OSTI Identifier:
860455
Report Number(s):
LBNL-49725
R&D Project: 505501; BnR: KC0202030; TRN: US200524%%189
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 65; Journal Issue: 19; Related Information: Journal Publication Date: 05/15/2002
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMPLITUDES; ATOMS; CONTRACTION; DIFFRACTION; ELECTRON DIFFRACTION; PROCESSING; SAPPHIRE; Surface Structure of a-Al2O3 LEED Anomolous ThermalVibrations

Citation Formats

Soares, E.A., Van Hove, M.A., Walters, C.F., and McCarty, K.F. The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations. United States: N. p., 2000. Web.
Soares, E.A., Van Hove, M.A., Walters, C.F., & McCarty, K.F. The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations. United States.
Soares, E.A., Van Hove, M.A., Walters, C.F., and McCarty, K.F. Fri . "The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations". United States. https://www.osti.gov/servlets/purl/860455.
@article{osti_860455,
title = {The structure of the alpha-Al2O3(0001) surface from low-energyelectron diffraction: Al termination and evidence for large thermalvibrations},
author = {Soares, E.A. and Van Hove, M.A. and Walters, C.F. and McCarty, K.F.},
abstractNote = {We have determined the surface structure of alpha-Al2O3(0001) using dynamical low-energy electron diffraction (LEED). Sapphire surfaces were prepared in three different ways, and the diffraction results were analyzed using an exhaustive search of possible models. For all sample processing conditions, the clearly favored structure has a single Al layer termination and a large first interlayer contraction. In addition, we find that the surface atoms have unusually large vibrational amplitudes at room temperature, suggestive of an anharmonic vibrational mode.},
doi = {},
journal = {Physical Review B},
number = 19,
volume = 65,
place = {United States},
year = {2000},
month = {5}
}