X-ray scattering study of the stoichiometric recovery of the α-Fe2O3(0001) surface

C. Y. Kim; A. A. Escuadro; M. J. Bedzyk; L. Liu; P. C. Stair

doi:10.1016/j.susc.2004.08.036

X-ray scattering study of the stoichiometric recovery of the α-Fe₂O₃(0001) surface

C. Y. Kim^*, A. A. Escuadro, M. J. Bedzyk, L. Liu, P. C. Stair

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient α-Fe₂O ₃(0001) are studied with X-ray scattering. Although oxygen annealing up to 735°C results in a stoichiometric top surface layer manifested as a (1 × 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe₃O₄ or γ-Fe ₂O₃. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature.

Original language	English (US)
Pages (from-to)	239-246
Number of pages	8
Journal	Surface Science
Volume	572
Issue number	2-3
DOIs	https://doi.org/10.1016/j.susc.2004.08.036
State	Published - Nov 20 2004

Keywords

Iron oxide
Oxidation
Sputtering
Surface structure, morphology, roughness, and topography
X-ray scattering, diffraction, and reflection

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.susc.2004.08.036

Cite this

@article{5687ee09fc694afd91689d05665f230d,

title = "X-ray scattering study of the stoichiometric recovery of the α-Fe2O3(0001) surface",

abstract = "The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient α-Fe2O 3(0001) are studied with X-ray scattering. Although oxygen annealing up to 735°C results in a stoichiometric top surface layer manifested as a (1 × 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe3O4 or γ-Fe 2O3. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature.",

keywords = "Iron oxide, Oxidation, Sputtering, Surface structure, morphology, roughness, and topography, X-ray scattering, diffraction, and reflection",

author = "Kim, {C. Y.} and Escuadro, {A. A.} and Bedzyk, {M. J.} and L. Liu and Stair, {P. C.}",

note = "Funding Information: This work was supported by NSF under contract No. CHE-9810378 and DOE under contract No. DE-FG02-03ER15457 to the Institute for Environmental Catalysis at NU. This research was carried out at the National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Division of Materials Sciences under contract No. DE-AC02-76CH00016.",

year = "2004",

month = nov,

day = "20",

doi = "10.1016/j.susc.2004.08.036",

language = "English (US)",

volume = "572",

pages = "239--246",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "2-3",

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TY - JOUR

T1 - X-ray scattering study of the stoichiometric recovery of the α-Fe2O3(0001) surface

AU - Kim, C. Y.

AU - Escuadro, A. A.

AU - Bedzyk, M. J.

AU - Liu, L.

AU - Stair, P. C.

N1 - Funding Information: This work was supported by NSF under contract No. CHE-9810378 and DOE under contract No. DE-FG02-03ER15457 to the Institute for Environmental Catalysis at NU. This research was carried out at the National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Division of Materials Sciences under contract No. DE-AC02-76CH00016.

PY - 2004/11/20

Y1 - 2004/11/20

N2 - The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient α-Fe2O 3(0001) are studied with X-ray scattering. Although oxygen annealing up to 735°C results in a stoichiometric top surface layer manifested as a (1 × 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe3O4 or γ-Fe 2O3. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature.

AB - The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient α-Fe2O 3(0001) are studied with X-ray scattering. Although oxygen annealing up to 735°C results in a stoichiometric top surface layer manifested as a (1 × 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe3O4 or γ-Fe 2O3. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature.

KW - Iron oxide

KW - Oxidation

KW - Sputtering

KW - Surface structure, morphology, roughness, and topography

KW - X-ray scattering, diffraction, and reflection

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DO - 10.1016/j.susc.2004.08.036

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SN - 0039-6028

VL - 572

SP - 239

EP - 246

JO - Surface Science

JF - Surface Science

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