Formation, Atomic Structures and Properties of Carbon Nanocage Materials

Atomic structures and properties of Ni nanowires are studied by using the generalized simulated annealing method with SuttonChen potential. Amorphous-like, helical, face-centered cubic and defect structures are found for different wire lengths. And from the analyses of the binding energy and angular correlation function (ACF), it is found that the helical structure of the Ni nanowires is the most stable form. With the compression and extension, the nanowires could transform from fcc [11 structure to fcc [110] one.

Download Full-text

Nanoglasses: A Way to Solid Materials with Tunable Atomic Structures and Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.584-586.41 ◽

2008 ◽

Vol 584-586 ◽

pp. 41-48 ◽

Cited By ~ 11

Author(s):

Herbert Gleiter

Keyword(s):

Atomic Structure ◽

Annealing Temperature ◽

Nanometer Scale ◽

The Novel ◽

Entire Volume ◽

Crystalline Materials ◽

Atomic Structures ◽

New Class ◽

Structures And Properties ◽

Structure Density

Recently, a new class of materials - called nanoglasses - with a glassy structure was synthesized. The novel feature of these materials is that the atomic structure in the entire volume of the material as well as the density of the material can be tuned. Nanoglasses are generated by introducing interfaces into metallic glasses on a nanometer scale. Interfaces in these nanoglasses delocalize upon annealing, so that the free volume associated with these interfaces spreads throughout the volume of the glass. This delocalization changes the atomic structure and the density of the glass throughout the volume. In fact, by controlling the spacing between the interfaces introduced into the glass as well as the degree of the delocalization (by modifying the annealing time and/or annealing temperature), the atomic structures as well as the density (and hence all structure/density dependent properties) of nanoglasses may be controlled. A comparable tuning of the atomic structure/density of crystalline materials is not conceivable, because defects in crystals do not delocalize upon annealing.

Download Full-text

Atomic Structures and Properties of Ceramic Interfaces –Combination of Cs-Corrected STEM and First Principles Calculations

Microscopy and Microanalysis ◽

10.1017/s1431927610058915 ◽

2010 ◽

Vol 16 (S2) ◽

pp. 1466-1467

Author(s):

Y Ikuhara ◽

Y Sato ◽

SD Findlay ◽

T Mizoguchi ◽

N Shibata ◽

...

Keyword(s):

First Principles ◽

First Principles Calculations ◽

Atomic Structures ◽

Structures And Properties ◽

Ceramic Interfaces

Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.

Download Full-text

Adding new dimension to electron tomography: measuring atomic structures and properties in 3D.

Microscopy and Microanalysis ◽

10.1017/s1431927612004473 ◽

2012 ◽

Vol 18 (S2) ◽

pp. 524-525 ◽

Cited By ~ 1

Author(s):

S. Bals ◽

B. Goris ◽

G. Van Tendeloo

Keyword(s):

Electron Tomography ◽

Atomic Structures ◽

Structures And Properties

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Download Full-text

Finding the Right Problems: Some HREM Applications to Interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100111938 ◽

1984 ◽

Vol 42 ◽

pp. 376-379

Author(s):

D. Cherns

Keyword(s):

Grain Boundaries ◽

High Resolution Electron Microscopy ◽

Boundary Structure ◽

Atomic Structures ◽

Grain Boundary Structure ◽

Resolution Electron ◽

Point To Point ◽

The Right ◽

New Generation ◽

Better Than

The use of high resolution electron microscopy (HREM) to determine the atomic structure of grain boundaries and interfaces is a topic of great current interest. Grain boundary structure has been considered for many years as central to an understanding of the mechanical and transport properties of materials. Some more recent attention has focussed on the atomic structures of metalsemiconductor interfaces which are believed to control electrical properties of contacts. The atomic structures of interfaces in semiconductor or metal multilayers is an area of growing interest for understanding the unusual electrical or mechanical properties which these new materials possess. However, although the point-to-point resolutions of currently available HREMs, ∼2-3Å, appear sufficient to solve many of these problems, few atomic models of grain boundaries and interfaces have been derived. Moreover, with a new generation of 300-400kV instruments promising resolutions in the 1.6-2.0 Å range, and resolutions better than 1.5Å expected from specialist instruments, it is an appropriate time to consider the usefulness of HREM for interface studies.

Download Full-text