Dodecahedral Local Ordering in Quasicrystals and in Approximants

1994 ◽  
Vol 150-151 ◽  
pp. 199-210 ◽  
Author(s):  
V.E. Dmitrienko
Keyword(s):  
Local Ordering

Electron-diffraction studies of amorphous carbon thin films

1993 ◽  
Vol 51 ◽  
pp. 1100-1101
Author(s):  
David A. Muller
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Amorphous Carbon ◽  
Glassy Carbon ◽  
Spherical Structure ◽  
Local Ordering ◽  
Carbon Arc ◽  
Similar Appearance ◽  
Carbon Thin Films ◽  
Large Spherical

The sp2 rich amorphous carbons have a wide variety of microstructures ranging from flat sheetlike structures such as glassy carbon to highly curved materials having similar local ordering to the fullerenes. These differences are most apparent in the region of the graphite (0002) reflection of the energy filtered diffracted intensity obtained from these materials (Fig. 1). All these materials consist mainly of threefold coordinated atoms. This accounts for their similar appearance above 0.8 Å-1. The fullerene curves (b,c) show a string of peaks at distance scales corresponding to the packing of the large spherical and oblate molecules. The beam damaged C60 (c) shows an evolution to the sp2 amorphous carbons as the spherical structure is destroyed although the (220) reflection in fee fcc at 0.2 Å-1 does not disappear completely. This 0.2 Å-1 peak is present in the 1960 data of Kakinoki et. al. who grew films in a carbon arc under conditions similar to those needed to form fullerene rich soots.

Short-range order and concentration fluctuations in binary molten alloys

1987 ◽  
Vol 65 (3) ◽  
pp. 309-325 ◽  
Author(s):  
R. N. Singh
Keyword(s):  
Lattice Theory ◽  
Order Parameter ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Concentration Fluctuations ◽  
Mixing Properties ◽  
Chemical Theory ◽  
Local Ordering ◽  
Interchange Energy

The quasi-chemical theory and the quasi-lattice theory are discussed with a view to obtaining information about concentration fluctuations, SCC(0), and the short-range order parameter, α1, for regular and compound-forming molten alloys. The influence of the coordination number z and the interchange energy ω on the mixing properties of the alloy is critically examined. SCC(0) and α1 have been found to be very useful in extracting microscopic information, like local ordering and segregation in molten systems. The problem of glass formation in compound-forming binary molten alloys is also briefly discussed.

scholarly journals Local Ordering of Molten Salts at NiO Crystal Interfaces Promotes High‐index Faceting

2021 ◽  
Author(s):  
Raffaele Cheula ◽  
Mariano D. Susman ◽  
David H. West ◽  
Sivadinarayana Chinta ◽  
Jeffrey D. Rimer ◽  
...  
Keyword(s):  
Molten Salts ◽  
High Index ◽  
Local Ordering ◽  
Crystal Interfaces

Locally-ordered PtNiPb ternary nano-pompons as efficient bifunctional oxygen reduction and methanol oxidation catalysts

Nanoscale ◽  
2019 ◽  
Vol 11 (36) ◽  
pp. 16945-16953 ◽  
Author(s):  
Na Cheng ◽  
Ling Zhang ◽  
Hao Jiang ◽  
Yingjie Zhou ◽  
Shengwei Yu ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Methanol Oxidation ◽  
Bifunctional Catalysts ◽  
Oxidation Catalysts ◽  
Open Structure ◽  
Local Ordering

Ternary PtNiPb NPs integrating the merits of a highly open structure, local-ordering and embedded Pb atoms as efficient bifunctional catalysts.

scholarly journals Predicting heterogeneous ice nucleation with a data-driven approach

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Martin Fitzner ◽  
Philipp Pedevilla ◽  
Angelos Michaelides
Keyword(s):  
Liquid Water ◽  
Ice Nucleation ◽  
Lattice Match ◽  
Density Reduction ◽  
Local Ordering ◽  
Data Driven Approach ◽  
Quantitative Understanding ◽  
Foreign Materials ◽  
Learning Analysis ◽  
Heterogeneous Ice Nucleation

Abstract Water in nature predominantly freezes with the help of foreign materials through a process known as heterogeneous ice nucleation. Although this effect was exploited more than seven decades ago in Vonnegut’s pioneering cloud seeding experiments, it remains unclear what makes a material a good ice former. Here, we show through a machine learning analysis of nucleation simulations on a database of diverse model substrates that a set of physical descriptors for heterogeneous ice nucleation can be identified. Our results reveal that, beyond Vonnegut’s connection with the lattice match to ice, three new microscopic factors help to predict the ice nucleating ability. These are: local ordering induced in liquid water, density reduction of liquid water near the surface and corrugation of the adsorption energy landscape felt by water. With this we take a step towards quantitative understanding of heterogeneous ice nucleation and the in silico design of materials to control ice formation.

scholarly journals Unraveling Na and F coupling effects in stabilizing Li, Mn-rich layered oxide cathodes via local ordering modification

2020 ◽  
Vol 31 ◽  
pp. 459-469 ◽  
Author(s):  
Panawan Vanaphuti ◽  
Jianming Bai ◽  
Lu Ma ◽  
Steven Ehrlich ◽  
Kim Kisslinger ◽  
...  
Keyword(s):  
Coupling Effects ◽  
Layered Oxide ◽  
Local Ordering ◽  
Oxide Cathodes ◽  
Layered Oxide Cathodes
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