Structures of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(111) surfaces observed by scanning tunneling

Lennie, Alistair R.; Condon, N.G.; Leibsle, F.M.; Murray, P. W.; Thornton, G.; Vaughan, David J.

doi:10.1103/physrevb.53.10244

Cited by 126 publications

(102 citation statements)

References 36 publications

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“…15 We note that on a slightly reduced sample surface, we find, in addition to this regular structure, regions where two different terminations, namely, at Fe oct2 and O 1 , respectively, coexist in an alternating manner ͑not shown͒. These alternating structures seem to be identical with what was previously seen by Lennie et al 11 However, there these structures were considered to be intrinsic for the stoichiometric magnetite surface, at variance with our results. Thus we could reproduce all known previously reported structures for Fe 3 O 4 ͑111͒ on one and the same sample surface by only slightly changing the preparation conditions.…”

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Thermodynamic stability and atomic and electronic structure of reducedFe3O4(111) single-crystal surfaces

et al. 2007

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Citation for published version (APA):Paul, M., Sing, M., Claessen, R., Schrupp, D., & Brabers, V. A. M. (2007). Thermodynamic stability and atomic and electronic structure of reduced Fe3 O4 (111) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nl providing details and we will investigate your claim. Magnetite ͑111͒ single-crystal surfaces prepared in situ under different reducing conditions and-as a result-with varying stoichiometries have been studied by scanning tunneling microscopy, low-energy electron diffraction, and x-ray photoemission spectroscopy. The coexistence of several surface structures has been detected, indicating only small differences in their relative stabilities. In particular, an unusual previously unreported superstructure has been found for a strongly reduced surface. Its microscopic origin is discussed against the background of recent results from scanning tunneling microscopy of the oxidized magnetite ͑111͒ surface and from ab initio thermodynamics. Partly at variance with and partly complementary to these results, we regard as driving force elastic strain due to the lateral mismatch between Fe 3 O 4 substrate and Fe 1−x O-like overlayer.

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“…8-10͒ and studies of single crystals. [11][12][13] In this work, we report on systematic investigations of thermally prepared synthetic single-crystal surfaces as prepared under reducing conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic stability and atomic and electronic structure of reducedFe3O4(111) single-crystal surfaces

et al. 2007

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“…Other orientations have to be prepared by the usual procedure of cutting, polishing, sputtering and annealing in vacuum or in O 2 atmosphere. Many metal-oxide surfaces have been prepared in this way as reviewed in [4][5][6], also among these are several surface planes of Fe 3 O 4 and α-Fe 2 O 3 single-crystals [135][136][137][138][139][140][141]. However, single-crystal samples may cause several experimental problems.…”

Section: Preparation Of Ordered Metal-oxide Surfacesmentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

579

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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“…The AES spectra revealed that the Fe 0.91 O surface consists of Fe and O atoms after annealing at 1 273 K in UHV. The surface structures on the bulk of the metallic iron 16,17) and other compounds such as Fe 3 O 4 [18][19][20][21][22] and Fe 2 O 3 , [23][24][25] have been investigated on the various crystallographic orientations. None of these reported structures are in agreement with the results obtained in this study.…”

Section: Facet Growth Of Polycrystalline Fe 1؊x O Surface By Annealingmentioning

confidence: 99%

Polycrystalline Wüstite Surface Observed by STM and LEED

et al. 2009

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After annealing at 1 273 K in UHV chamber to remove adsorbed molecule, the surface crystal structure and the composition of polycrystalline Fe 1Ϫx O were analyzed at room temperature using STM, LEED and AES. The Fe 1Ϫx O sample was prepared by oxidizing an polycrystalline electrolytic iron strip. The Fe 1Ϫx O surface consists of facets, where many steps like zig-zag shape are arranged. The mesh-like structure, of which periodicity is about 0.8-1.3 nm, was observed on the terrace. The facets are (001) planes of Fe 1Ϫx O, and the step direction is ͗110͘ by LEED measurement. The mesh-like structure is considered as the defect clusters derived from nonstoichiometry.

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Structures ofFe3O4(111) surfaces observed by scanning tunneling

Cited by 126 publications

References 36 publications

Thermodynamic stability and atomic and electronic structure of reducedFe3O4(111) single-crystal surfaces

Thermodynamic stability and atomic and electronic structure of reducedFe3O4(111) single-crystal surfaces

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Polycrystalline Wüstite Surface Observed by STM and LEED

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