Einführung in die Kristallographie

Kleber, W.

doi:10.1524/9783486598858

Cited by 72 publications

(38 citation statements)

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“…The honeycomb row end points are located along a tilt grain boundary, where slightly inclined superstructure rows meet. This tilt grain boundary in an epitaxial monolayer film is the two-dimensional analogy to the well-known tilt grain boundaries in three-dimensional crystals [262].…”

Section: Defect Structuressupporting

confidence: 52%

“…Here, the fast growing ( ) 21 1 planes eventually disappear and the slow growing stable ( ) 111 surface planes remain, leading to large triangular islands that expose only ( ) 111 facets, as indicated in Fig. 5.25 [262]. The formation of triangular shaped islands rotated by 180° indicates the existence of two in-plane orientations of Fe 3 O 4 (111) related by an 180° rotation about the [111] axes.…”

Section: (Iii) Fe 3 O 4 Island Growth Mechanismmentioning

confidence: 93%

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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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Section: Defect Structuressupporting

confidence: 52%

Section: (Iii) Fe 3 O 4 Island Growth Mechanismmentioning

confidence: 93%

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

Weiß

Ranke

2002

Progress in Surface Science

584

610

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“…Furthermore, these crystals were elongated along the crystallographic c-axis with (021) faces as endfaces, which terminate the crystal in this directon. Hence, from crystallographic reasoning, the (021) must be the fastest growing face when compared to the (110) and (100) face, and due to the low abundance of (100), this face must be faster growing than the (110) face (Kleber, 1990). One reason was reported by Weidler et al (1996), who attributed vicinal faces on the (100) to be responsible for a larger growth rate.…”

Section: Introductionmentioning

confidence: 99%

Determination of growth rates of (100) and (110) faces of synthetic goethite by scanning force microscopy

Weidler

Hug²,

Wetche³

et al. 1998

Geochimica et Cosmochimica Acta

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“…quartz, mica, etc.). Calcite and dolomite exhibit a pronounced anisotropy of the thermal expansion coefficient at different crystallographic directions (Kleber 1959) leading to stresses within the sample during heating ( Fig. 5a-d).…”

Section: Marble Weatheringmentioning

confidence: 99%

Development and assessment of protective winter covers for marble statuaries of the Schlossbrücke, Berlin (Germany)

Ruedrich¹,

Rieffel²,

Pirskawetz

et al. 2010

Environ Earth Sci

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The present study documents the results of an inter-disciplinary model project that was planned with the aim of developing an innovative winter covering system for marble statuaries located on the Schlossbrücke (Berlin). Such a system would need to fulfil the various requirements for structural stability, aesthetics, climate and practical use. This applied research represents the first complex scientific study of the sustainability of a winter covering system. The study is characterised by the use of complex scientific instruments such as special laboratory analysis and numerical simulation tools. The interaction between the environment and the artefacts in connection with the innovative winter covering structures were studied by extensive climatic monitoring.

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Einführung in die Kristallographie

Cited by 72 publications

References 0 publications

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

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

Determination of growth rates of (100) and (110) faces of synthetic goethite by scanning force microscopy

Development and assessment of protective winter covers for marble statuaries of the Schlossbrücke, Berlin (Germany)

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