Formation of a well-ordered aluminium oxide overlayer by oxidation of NiAl(110)

Jaeger, R.; Kuhlenbeck, Helmut; Freund, H.‐J.; Wuttig, Matthias; Hoffmann, W.; Franchy, R.; Ibach, H.

doi:10.1016/0039-6028(91)90555-7

Cited by 557 publications

(397 citation statements)

References 38 publications

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“…The native oxide scale is thus composed of Al 2 O 3 consistent with our experimental results. Similar observations were also made by Jaeger et al 46 and Franchy et al 47 in their experimental studies of low-temperature oxygen adsorption on Ni-Al͑111͒ surfaces. In the case of atomic oxidation with and without externally applied electric field ͑10 MV/cm͒, we note that the Ni-O PDF shows a peak at ϳ2.0 Å ͓Fig.…”

Section: Ni-al Substratesupporting

confidence: 86%

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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We report on the ability to modify the structure and composition of ultrathin oxides grown on Ni and Ni-Al alloy surfaces at room temperature utilizing photon illumination. We find that the nickel-oxide formation is enhanced in the case of oxidation under photo-excitation. The enhanced oxidation kinetics of nickel in 5% Ni-Al alloy is corroborated by experimental and simulation studies of natural and photon-assisted oxide growth on pure Ni͑100͒ surfaces. In case of pure Ni substrates, combined x-ray photoelectron spectroscopy analysis, and atomic force microscope current mapping support the deterministic role of the structure of nickel passiveoxide films on their nanoscale corrosion resistance. Atomistic simulations involving dynamic charge transfer predict that the applied electric field overcomes the activation-energy barrier for ionic migration, leading to enhanced oxygen incorporation into the oxide, enabling us to tune the mixed-oxide composition at atomic length scales. Atomic scale control of ultrathin oxide structure and morphology in the case of pure substrates as well as compositional tuning of complex oxide in the case of alloys leads to excellent passivity as verified from potentiodynamic polarization experiments.

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Section: Ni-al Substratesupporting

confidence: 86%

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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“…Such films also turn out to be very clean if compared to single-crystal samples. Well-ordered films of several transition metal-oxides (Ni, Cr, Fe) were prepared by oxidizing the surface region of the corresponding metal single-crystals [10,142], and ordered Al 2 O 3 films were obtained by surface oxidation of NiAl single-crystals [143].…”

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

584

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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“…It has been shown that even films with a thickness of just a few Angstroms can exhibit physical properties characteristic of the bulk material (Freund 1995). The traditional method to prepare such films is the oxidation of the native metal (Freund 1995) or an alloy (Jaeger et al 1991;Libuda et al 1994;Bardi et al 1992;Becker et al 1998), although this often results in amorphous or polycrystalline overlayers [e.g., Al oxide on Al (Chen et al 1987;Belton and Schmieg 1988a, b;Chen et al 1992), or Si oxide on Si (Rochet et al 1986;Pantelides et al 1978)] or films with a rather high defect density. This is due to the large mismatch which usually exists between the metal and the oxide lattice [e.g., NiO(100)/Ni(100) (Bäumer et al 1991)].…”

Section: S6mentioning

confidence: 99%

“…This is due to the large mismatch which usually exists between the metal and the oxide lattice [e.g., NiO(100)/Ni(100) (Bäumer et al 1991)]. There are a few examples where well-ordered crystalline films can be obtained in this way [e.g., Cr 2 O 3 (111) on Cr(110) (Kuhlenbeck et al 1992;Rohr et al 1997a, b) or Al 2 O 3 on NiAl(110) (Jaeger et al 1991;Libuda et al 1994) and Ni 3 Al(111) (Bardi et al 1992;Becker et al 1998)].…”

Section: S6mentioning

confidence: 99%

Models for heterogeneous catalysts: studies at the atomic level

Freund

2016

Rend. Fis. Acc. Lincei

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A systematic approach to model heterogeneous catalyst material and characterization at the atomic level is presented. Two examples are used to illustrate the concepts derived from those studies. They document the problems arising on the way to create such model systems and they also indicate possible solutions. The first example is connected with activation of CO 2 at the rim of electron rich MgO (thin film-supported Au islands), and the second example aims at the creation of a model system for the Phillips catalyst for ethylene polymerization and, in particular, the creation of a hydroxylated silica support.

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Formation of a well-ordered aluminium oxide overlayer by oxidation of NiAl(110)

Cited by 557 publications

References 38 publications

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

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

Models for heterogeneous catalysts: studies at the atomic level

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