Epitaxial oxide formation on Cr(110) films

Stierle, Andreas; Bödeker, P.; Zabel, H.

doi:10.1016/0039-6028(94)00830-2

Cited by 46 publications

(21 citation statements)

References 23 publications

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“…Each scan contains the main ð0 0 2Þ Bragg peak as well as the AE1 and in some case also the AE2 satellite peaks arising from the coherent structure of the superlattices. The Laue fringes visible between the main peak and the satellite peaks are related to the coherent part of the total sample thickness, and the presence of these fringes is a marker of the well-defined total thickness of the superlattice structure [27]. The Pd capping layer does not contribute to this interference pattern due to the lack of epitaxial relation to the underlying structure.…”

Section: Structural Characterizationmentioning

confidence: 98%

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

Marcellini

Pärnaste

Hjörvarsson

et al. 2009

Journal of Magnetism and Magnetic Materials

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Section: Structural Characterizationmentioning

confidence: 98%

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

Marcellini

Pärnaste

Hjörvarsson

et al. 2009

Journal of Magnetism and Magnetic Materials

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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

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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“…Previous studies of chromium oxide surfaces involved oxidation of low index Cr single-crystals [14][15][16][17][18][19][20][21][22][23][24][25][26][27]; surfaces of a-Cr 2 O 3 (0001) bulk crystals [28,29]; and oxidation of ultra thin films of chromium oxide grown on such transition and noble metal substrates as Pt(111) [30], Ag(111) [31], Cu(111) [32], Cu(100) [33] and Cu(110) [34] as well as on alumina [35] and W(100) [36]. Of these, only a few [15,16,28,29,31] involved quantitative surface structure determinations.…”

Section: Introductionmentioning

confidence: 99%