Results 221 to 230 of about 31,675 (266)
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Direct structure reconstruction in HRTEM
Ultramicroscopy, 1996Abstract In this paper we propose a new method for the interpretation of exit wave functions in electron microscopy. These wave functions can experimentally be obtained by an holographic wave function reconstruction technique such as focal series reconstruction, off-axis holography or ptychography.
op de Beeck, M., Van Dyck, D.
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Optimal accelerating voltage for HRTEM imaging of zeolite
Microscopy, 2012The electron irradiation damage of MFI-type zeolite was estimated under various accelerating voltages of 100, 200 and 300 kV from successively captured high-resolution transmission electron microscopy (HRTEM) images. To determine the optimal accelerating voltage for HRTEM imaging of electron-sensitive MFI zeolite, the critical dose was estimated from ...
Kaname, Yoshida, Yukichi, Sasaki
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HRTEM studies of amorphous ZrNiTiCu nanocrystalline composites
Journal of Microscopy, 2010SummaryBall milling of easy glass forming Ti25Zr17Ni29Cu29 alloys lead to the formation of an amorphous structure accompanied by a substantial increase of powder microhardness. The powders show clear glass transition effect and a few stage crystallization starting above 500°C.
J, Dutkiewicz +5 more
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Quantitative HRTEM analysis of FIB prepared specimens
Journal of Microscopy, 2008SummaryThe preparation of good transmission electron microscopy specimens with minimum milling damage can be very complicated, especially from a specific area in a sample. Therefore, a novel approach for transmission electron microscopy specimen preparation using a focused ion beam system is proposed, based on the use of low energy (5 kV)Ga ions and a ...
M, Baram, W D, Kaplan
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Local estimation of lattice constants in HRTEM images
Ultramicroscopy, 2011A model-based approach to estimate lattice constants from an atomically resolved HRTEM image is presented. The approach only utilizes the inherent periodicity of these images and does not require a centrosymmetric structure of the specimen. This allows the evaluation of, for instance, wurtzite-based materials like InGaN/GaN heterostructures.
T, Niermann, J B, Park, M, Lehmann
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HRTEM of Decahedral Gold Particles
1992Decahedral gold particles supported on carbon are analysed by high resolution TEM. Evidence is found that supports the existence of non-fcc structures in this type of particles. The existence of angles larger than 70.5 degrees for {111} planes supports a model based on a body centered orthorhombic structure.
M. Avalos-Borja +2 more
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HRTEM study of Si1−xGex multilayer
Thin Solid Films, 1997Abstract Epitaxial Si1−xGex (0≤x≤1) multilayers, grown on Si(001) at 350 °C using a hot-wire assisted gas source molecular beam epitaxy, were observed by HRTEM. Two sample preparation techniques are compared: Ar+ ion milling and tripod thinning. It is shown that the first one gives rise to an important crystalline reorganization whereas the second ...
J. Werckmann +5 more
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HRTEM analysis of Pt/C multilayers
SPIE Proceedings, 2004High-resolution transmission electron microscopy (HRTEM) studies were performed on Pt/C multilayers fabricated for x-ray mirror optics. The multilayers with d-spacing of about 4 nm were deposited either by dc-magnetron sputtering or by ion-beam sputtering on commercially available Si wafer substrates.
Naoyuki Ohnishi +5 more
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Quantifying and Processing HRTEM Images
1996In this chapter we will equate our title with the use of the computer. We will simply use image processing to extract more information from a TEM image than we can obtain by eye. In the past the optical bench was also used for this purpose, but the number of optical benches is negligible compared to the number of computers now found in every TEM lab ...
David B. Williams, C. Barry Carter
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HRTEM and chemical analysis of NiAl-5Ti
Proceedings, annual meeting, Electron Microscopy Society of America, 1996NiAl-based alloys are currently being studied to determine the effects of alloying additions on the mechanical and physical properties of NiAl. Microstructural changes due to varying alloy composition have been determined and related to the mechanical properties, but high-resolution imaging and compositional profiles of the nanophases and interfaces in
A. W. Wilson +3 more
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