Building block analysis of 2D amorphous networks reveals medium range correlation

Büchner, Christin; Liu, Liwei; Stuckenholz, Stefanie; Burson, Kristen M.; Lichtenstein, Leonid; Heyde, Markus; Gao, Hongjun; Freund, Hans‐Joachim

doi:10.1016/j.jnoncrysol.2015.12.020

Cited by 39 publications

(49 citation statements)

References 20 publications

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“…In contrast, amorphous silica BL presents asmall number of the (5,5,8) triplet combination while the (6,6,6) predominates. [14] These observations are in line with the DFT results showing al ack of 6M Rs as discussed above.M oreover,t he most prevalent antiphase boundary in the crystalline silica BL is formed by al inear arrangement of (5,5,8) ring-combinations. [15] AD DO analysis [16] provides further insight into the observed phase change from crystalline to amorphous germania.…”

Section: Angewandte Chemiesupporting

confidence: 90%

From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

et al. 2019

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A new two‐dimensional (2D) germanium dioxide film has been prepared. The film consists of interconnected germania tetrahedral units forming a bilayer structure, weakly coupled to the supporting Pt(111) metal‐substrate. Density functional theory calculations predict a stable structure of 558‐membered rings for germania films, while for silica films 6‐membered rings are preferred. By varying the preparation conditions the degree of order in the germania films is tuned. Crystalline, intermediate ordered and purely amorphous film structures are resolved by analysing scanning tunnelling microscopy images.

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Section: Angewandte Chemiesupporting

confidence: 90%

From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

et al. 2019

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“…These new results on 2D glasses have opened up numerous opportunities to study the structure of glasses using actual atomic coordinates. Recent work on 2D glasses includes modeling of silica bilayers [13,14], ring distribution [15], medium-range order [16], suitable boundary conditions to recover missing constraints in the surface [17] and the refinement of experimental samples [18]. Rigidity theory has also uncovered a connection between 2D glasses and jammed disk packings [19,20].…”

Section: Introductionmentioning

confidence: 99%

Ring correlations in random networks

Sadjadi

Thorpe

2016

Phys. Rev. E

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We examine the correlations between rings in random network glasses in two dimensions as a function of their separation. Initially, we use the topological separation (measured by the number of intervening rings), but this leads to pseudo-long-range correlations due to a lack of topological charge neutrality in the shells surrounding a central ring. This effect is associated with the noncircular nature of the shells. It is, therefore, necessary to use the geometrical distance between ring centers. Hence we find a generalization of the Aboav-Weaire law out to larger distances, with the correlations between rings decaying away when two rings are more than about three rings apart.

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“…From the two states possible for the SiO 2 bilayer, the vitreous phase seems to be the most promising so far in terms of the permeability to gases due to the presence of pores having more than 6 members [59]. In the case of the SiO 2 / Ru(0001) system, it has been reported the possibility of intercalating simple molecules such as CO and D 2 under the amorphous film, that means into the confined space enclosed between the silica sheet and the Ru(0001) surface, under well-defined experimental conditions.…”

Section: Application In Catalysismentioning

confidence: 99%

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

Prieto

Schmidt

2017

Catal Lett

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Catalysis is a hot topic in research with the focus on finding catalysts that show better activity or selectivity on processes on technological or industrial interest. The use of model systems of applicable materials has proven to be a successful approach in the last decades to obtain information on the fundamental properties of these materials, leading eventually to a better understanding how real catalysts work. This knowledge is extremely important in the sense that it allows an optimization of the catalyst composition, thus leading to a rational design of new materials. For these fundamental studies, a variety of probing techniques such as X-ray photo-electron spectroscopy, scanning tunnel microscopy, and temperature programmed desorption have been applied. In this article, we discuss how low energy electron microscopy (LEEM) and photoemission electron microscopy (PEEM) can contribute to the fundamental understanding of relevant surface processes taking place on model catalysts. Also, the capability of these techniques on addressing open questions in catalysis is discussed

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Building block analysis of 2D amorphous networks reveals medium range correlation

Cited by 39 publications

References 20 publications

From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

From Crystalline to Amorphous Germania Bilayer Films at the Atomic Scale: Preparation and Characterization

Ring correlations in random networks

LEEM and PEEM as Probing Tools to Address Questions in Catalysis

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