Hydrated α-Fe2O3(1 over(1, ̄) 0 2) surface structure: Role of surface preparation

Kunaljeet S. Tanwar; Jeffrey G. Catalano; Sarah C. Petitto; Sanjit K. Ghose; Peter J. Eng; Thomas P. Trainor

doi:10.1016/j.susc.2007.04.115

Hydrated α-Fe₂O₃(1 over(1, ̄) 0 2) surface structure: Role of surface preparation

Kunaljeet S. Tanwar
, Jeffrey G. Catalano
, Sarah C. Petitto
, Sanjit K. Ghose
, Peter J. Eng
, Thomas P. Trainor

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

58 Scopus citations

Abstract

The surface structure of α-Fe₂ O₃ (1 over(1, ̄) 0 2) was studied under two different surface preparation conditions using crystal truncation rod (CTR) diffraction. Wet chemical and mechanical polishing (CMP) at 298 K results in a crystalline surface termination in which the top layer of iron atoms is absent compared to the stoichiometric bulk termination. Annealing in air at 773 K resulted in a transformation of the surface to a structure consistent with hydroxylation of the stoichiometric termination. These results agree with theoretical predictions of Lo et al. [C.S. Lo, K.S. Tanwar, A.M. Chaka, T.P. Trainor, Phys. Rev. B 75 (2007) 075425] and clearly show an ambient pressure surface preparation path leading to a stoichiometric hydroxylated surface, which is apparently a meta-stable configuration at room temperature.

Original language	English
Pages (from-to)	L59-L64
Journal	Surface Science
Volume	601
Issue number	12
DOIs	https://doi.org/10.1016/j.susc.2007.04.115
State	Published - Jun 15 2007

Keywords

Crystal truncation rods
Hematite (1 over(1, ̄) 0 2)
Iron oxide
Surface X-ray diffraction
Surface annealing
Surface preparation
Surface structure
α-FeO

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10.1016/j.susc.2007.04.115

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@article{aeadf7846941428bb815c156567a51a5,

title = "Hydrated α-Fe2O3(1 over(1,{\= }) 0 2) surface structure: Role of surface preparation",

abstract = "The surface structure of α-Fe2 O3 (1 over(1,{\= }) 0 2) was studied under two different surface preparation conditions using crystal truncation rod (CTR) diffraction. Wet chemical and mechanical polishing (CMP) at 298 K results in a crystalline surface termination in which the top layer of iron atoms is absent compared to the stoichiometric bulk termination. Annealing in air at 773 K resulted in a transformation of the surface to a structure consistent with hydroxylation of the stoichiometric termination. These results agree with theoretical predictions of Lo et al. [C.S. Lo, K.S. Tanwar, A.M. Chaka, T.P. Trainor, Phys. Rev. B 75 (2007) 075425] and clearly show an ambient pressure surface preparation path leading to a stoichiometric hydroxylated surface, which is apparently a meta-stable configuration at room temperature.",

keywords = "Crystal truncation rods, Hematite (1 over(1,{\= }) 0 2), Iron oxide, Surface X-ray diffraction, Surface annealing, Surface preparation, Surface structure, α-FeO",

author = "Tanwar, \{Kunaljeet S.\} and Catalano, \{Jeffrey G.\} and Petitto, \{Sarah C.\} and Ghose, \{Sanjit K.\} and Eng, \{Peter J.\} and Trainor, \{Thomas P.\}",

year = "2007",

month = jun,

day = "15",

doi = "10.1016/j.susc.2007.04.115",

language = "English",

volume = "601",

pages = "L59--L64",

journal = "Surface Science",

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TY - JOUR

T1 - Hydrated α-Fe2O3(1 over(1, ̄) 0 2) surface structure

T2 - Role of surface preparation

AU - Tanwar, Kunaljeet S.

AU - Catalano, Jeffrey G.

AU - Petitto, Sarah C.

AU - Ghose, Sanjit K.

AU - Eng, Peter J.

AU - Trainor, Thomas P.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - The surface structure of α-Fe2 O3 (1 over(1, ̄) 0 2) was studied under two different surface preparation conditions using crystal truncation rod (CTR) diffraction. Wet chemical and mechanical polishing (CMP) at 298 K results in a crystalline surface termination in which the top layer of iron atoms is absent compared to the stoichiometric bulk termination. Annealing in air at 773 K resulted in a transformation of the surface to a structure consistent with hydroxylation of the stoichiometric termination. These results agree with theoretical predictions of Lo et al. [C.S. Lo, K.S. Tanwar, A.M. Chaka, T.P. Trainor, Phys. Rev. B 75 (2007) 075425] and clearly show an ambient pressure surface preparation path leading to a stoichiometric hydroxylated surface, which is apparently a meta-stable configuration at room temperature.

AB - The surface structure of α-Fe2 O3 (1 over(1, ̄) 0 2) was studied under two different surface preparation conditions using crystal truncation rod (CTR) diffraction. Wet chemical and mechanical polishing (CMP) at 298 K results in a crystalline surface termination in which the top layer of iron atoms is absent compared to the stoichiometric bulk termination. Annealing in air at 773 K resulted in a transformation of the surface to a structure consistent with hydroxylation of the stoichiometric termination. These results agree with theoretical predictions of Lo et al. [C.S. Lo, K.S. Tanwar, A.M. Chaka, T.P. Trainor, Phys. Rev. B 75 (2007) 075425] and clearly show an ambient pressure surface preparation path leading to a stoichiometric hydroxylated surface, which is apparently a meta-stable configuration at room temperature.

KW - Crystal truncation rods

KW - Hematite (1 over(1, ̄) 0 2)

KW - Iron oxide

KW - Surface X-ray diffraction

KW - Surface annealing

KW - Surface preparation

KW - Surface structure

KW - α-FeO

UR - https://www.scopus.com/pages/publications/34249883851

U2 - 10.1016/j.susc.2007.04.115

DO - 10.1016/j.susc.2007.04.115

M3 - Article

AN - SCOPUS:34249883851

SN - 0039-6028

VL - 601

SP - L59-L64

JO - Surface Science

JF - Surface Science

IS - 12

ER -

Hydrated α-Fe₂O₃(1 over(1, ̄) 0 2) surface structure: Role of surface preparation

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Keywords

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