Interaction of surface misfit and monatomic steps on unreconstructed {110} surfaces of anisotropic f.c.c. crystals I. Ledges parallel to rectangular surface unit cell axes

1992 ◽  
Vol 208 (1) ◽  
pp. 106-114 ◽  
Author(s):  
Herbert Willi Kunert ◽  
Jan H. van der Merwe
Keyword(s):  
Unit Cell ◽  
Surface Unit ◽  
Surface Unit Cell

Molecular Dynamics Simulations of Low-Energy Ion/Surface Interactions During Vapor Phase Crystal Growth: 10 eV Si Incident on Si(001)2×1

1989 ◽  
Vol 157 ◽  
Author(s):  
M. Kitabatake ◽  
P. Fons ◽  
J. E. Greene
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Unit Cell ◽  
Many Body ◽  
Energy Redistribution ◽  
Surface Unit ◽  
Phase Crystal ◽  
Dynamics Simulations ◽  
Body Potential ◽  
Surface Unit Cell

ABSTRACTMolecular dynamics simulations, utilizing the Tersoff many-body potential, were used to investigate the effects of 10 eV Si atom bombardment of a (001)2×1 terminated Si lattice. The irradiation events were initiated at an array of points in the primitive surface unit cell. Each event was followed to determine kinetic energy redistribution in the lattice as a function of time, projectile and lattice atom trajectories, and the nature, number, and depth of residual defects. Dimer breaking, epitaxial growth, position exchange, and the formation of residual hexagonal and split interstitials were observed. There were no residual vacancies. Impact points leading to each of the above results clustered in distinctly different regions of the surface unit cell. Bulk interstitials were annealed out over time scales corresponding to monolayer deposition during Si MBE.

scholarly journals Independently Tunable Closely Spaced Triband Frequency Selective Surface Unit Cell using the Third Resonant Mode of Split Ring Slots

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Henry Fabian-Gongora ◽  
Alexander E. Martynyuk ◽  
Jorge Rodriguez-Cuevas ◽  
Lourdes Martinez-Lopez ◽  
Rosalba Martinez-Lopez ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Resonant Mode ◽  
Unit Cell ◽  
Split Ring ◽  
The Third ◽  
Surface Unit ◽  
Frequency Selective ◽  
Surface Unit Cell

La induced Si3 trimer bilayer on Si(111) surface

2021 ◽  
Author(s):  
Jun-Shuai Chai ◽  
Guang Yang ◽  
Jing Xu ◽  
Wenwu Wang ◽  
Li-Fang Xu ◽  
...  
Keyword(s):  
First Principles ◽  
Unit Cell ◽  
First Principles Calculations ◽  
Surface Unit ◽  
Surface Unit Cell

Using first-principles calculations, we identify a robust (√3 × √3)R30° reconstruction of Si3 trimer bilayer on Si(111) surface with a La coverage of 2/3 monolayer. In each surface unit cell,...

A New Geometric Model for Three-Dimensional Braided Composites

2014 ◽  
Vol 662 ◽  
pp. 15-19 ◽  
Author(s):  
Chen Bing Ni ◽  
Gao Feng Wei
Keyword(s):  
Cross Section ◽  
Geometric Model ◽  
Geometric Analysis ◽  
Three Dimensional ◽  
Structural Features ◽  
Unit Cell ◽  
Braided Composites ◽  
Unit Cells ◽  
Analysis Models ◽  
Surface Unit Cell

According to the structural features of 3-D braided composites, the whole structure is divided into three types of sub-unit cells, these are the interior unit cell, the surface unit cell and the corner unit cell. Considering the bending of fiber bundle and the deformation of cross-section which are caused by the space fiber extrusion and twist together, the corresponding geometric analysis models for every type of sub-unit cell are established, and the engineering elastic constants of the 3-D braided composites are predicted. The results show that the calculated results well agree with the experimental results, and the effectiveness of the model is verified.

High-resolution structure determination by ALCHEMI

1983 ◽  
Vol 41 ◽  
pp. 178-181 ◽  
Author(s):  
Peter G. Self ◽  
Peter R. Buseck
Keyword(s):  
Site Occupancy ◽  
Real Space ◽  
Unit Cell ◽  
Bragg Angle ◽  
Electron Current ◽  
High Resolution Structure ◽  
Beam Incident ◽  
Crystallographic Planes ◽  
Electron Beam Incident ◽  
Resolution Structure

ALCHEMI (Atom Location by CHanneling Enhanced Microanalysis) enables the site occupancy of atoms in single crystals to be determined. In this article the fundamentals of the method for both EDS and EELS will be discussed. Unlike HRTEM, ALCHEMI does not place stringent resolution requirements on the microscope and, because EDS clearly distinguishes between elements of similar atomic number, it can offer some advantages over HRTEM. It does however, place certain constraints on the crystal. These constraints are: a) the sites of interest must lie on alternate crystallographic planes, b) the projected charge density on the alternate planes must be significantly different, and c) there must be at least one atomic species that lies solely on one of the planes.An electron beam incident on a crystal undergoes elastic scattering; in reciprocal space this is seen as a diffraction pattern and in real space this is a modulation of the electron current across the unit cell. When diffraction is strong (i.e., when the crystal is oriented near to the Bragg angle of a low-order reflection) the electron current at one point in the unit cell will differ significantly from that at another point.

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