D. J. H. Cockayne
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Effect of Eshelby twist on core structure of screw dislocations in molybdenum: atomic structure and electron microscope image simulations Open
\n This paper addresses the question as to whether the core structure of screw dislocations in Mo in the bulk can be obtained from HREM images of such dislocations viewed end-on in a thin foil. Atomistic simulations of the core structure o…
Local structures of two metallic glasses with good plasticity Open
The local structures of two metallic glasses with good plasticity, i.e., Al89La6Ni5 and Cu49Hf42Al9, were studied by reduced density functions (RDFs) from electron diffraction in a transmission electron microscope. Atomic models were refin…
Quantitative high resolution electron microscopy image matching applied to the strontium titanate Σ3(112) grain boundary Open
Quantitative image matching has been employed in order to compare experimentally observed grain boundary structure to predicted model structures for the strontium titanate (SrTiO3) Σ3(112) grain boundary. Initially, quantitative image matc…
The nanoworld through aberration corrected lenses Open
The advent of aberration correction for electron microscope lenses has produced a significant advance in the improvement of resolution in microscopy. This improvement, while significant in itself, promises to have its most profound impact …
Imaging and analysis of axial heterostructured silicon nanowires Open
Silicon nanowires with axially varying n- and p-doping were grown by the vapor-liquid-solid approach using gold as the catalyst. The microstructures of the axial heterostructured silicon nanowires were studied using electron microscopy tec…
New possibilities with aberration-corrected electron microscopy Open
Unlike light microscopy, where resolution is diffraction Thursday, August 6, 2009 at 5:26 pmlimited, the achievable resolution of electron microscopes is limited by lens aberrations so severe that the practical resolution is orders of magn…
How the bond length can affect C<sub>70</sub>DOS and EEL spectra Open
The combination of electron energy loss (EEL) spectroscopy and density functional theory can lead to an understanding of how changes within a material lead to changes in electronic structure. In the past, C70 EEL spectra have been interpre…
Oxford CyberSEM: remote microscopy Open
The Internet has enabled researchers to communicate over vast geographical distances, sharing ideas and documents. e-Science, underpinned by Grid [1] and Web Services, has enabled electronic communications to the next level where, in addit…
Orientation‐dependent surface composition of <i>i</i> n situ annealed strontium titanate Open
The surface composition of polycrystalline niobium‐doped strontium titanate (SrTiO 3 : Nb) is studied using X‐ray photoelectron emission microscopy (XPEEM) for many grain orientations in order to characterise the surface chemistry with hig…
Studies of grain orientations and grain boundaries in polycrystalline SrTiO<sub>3</sub> Open
Grain size and grain boundary misorientations of niobium-doped and undoped polycrystalline SrTiO3 have been investigated as a function of sintering time, in order to clarify conflicting reports about grain growth in this material. The obse…
Modelling of crystalline C<sub>60</sub> EEL spectra Open
Electron energy-loss spectra are simulated from two experimentally determined C60 crystal structures. It is found that the decrease in symmetry from an face centred cubic to a simple cubic structure cause a splitting of the unoccupied stat…
Modelling Ge/Si quantum dots using finite element analysis and atomistic simulation Open
Finite Element Analysis (FEA) and atomistic simulations are used to model Ge/Si quantum dots. The three dimensional non-uniform composition profile in Ge(Si)/Si(001) quantum dots is calculated using atomistic modelling. The results are com…
Structural Refinement of Amorphous Alloy Nanovolumes Using RDF Analysis Open
Extract HTML view is not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button. Extended abstract of a paper presented at Microscopy and Microanalysis 2005 in Hono…
TEM Investigations of the Compositions in Ge(Si)/Si(001) Quantum Dots Open
Journal Article TEM Investigations of the Compositions in Ge(Si)/Si(001) Quantum Dots Get access X Z Liao, X Z Liao Los Alamos National Laboratory, Division of Materials Science and Technology, Los Alamos, NM 87545 Search for other works b…
View article: Composition distributions in Ge(Si)/Si(001) quantum dots
Composition distributions in Ge(Si)/Si(001) quantum dots Open
Knowledge on the composition of hetero-epitaxial grown semiconductor quantum dots (QDs) is very important for revealing the growth mechanisms and the structure-property relationships of the QDs. However, composition determination in QDs is…
Optical transition in infrared photodetector based on V-groove Al0.5Ga0.5As/GaAs multiple quantum wire Open
Photoconductors based on V-grooved Al0.5Ga0.5As/GaAs multiple quantum wires (QWR) were fabricated. The geometric structure of the QWR was carefully characterized by transmission electron microscopy and spatially resolved microphotoluminesc…
Anodic-oxide-induced interdiffusion in GaAs/AlGaAs quantum wells Open
Enhancement of interdiffusion in GaAs/AlGaAs quantum wells due to anodic oxides was studied. Photoluminescence, transmission electron microscopy, and quantum well modeling were used to understand the effects of intermixing on the quantum w…
Effects of anodic oxide induced intermixing on the structural and optical properties of quantum wire structure grown on nonplanar GaAs substrate Open
Effects of anodic oxide induced intermixing on the structural and optical properties of stacked GaAs quantum wire (QWR) structures grown on a sawtooth-type nonplanar GaAs substrate are investigated. Cross-sectional transmission electron mi…
Equilibrium dissociation configuration of misfit dislocations in low strained In0.1Ga0.9As/GaAs single heterostructures Open
Equilibrium dissociation configurations of 60° misfit dislocations in low strained [001] In0.1Ga0.9As/GaAs single heterostructures are investigated by high resolution electron microscopy. The dissociation configuration of misfit dislocatio…
Electron diffraction of amorphous thin films using PEELS Open
In previous work, a method for obtaining accurate reduced density functions, G(r), from chosen small regions of amorphous and polycrystalline thin films was described. The method involves scanning an electron diffraction pattern across the…
Studies of lattice defects using weak diffracted beams Open
The diffraction contrast of lattice defects on TEM images is usually calculated by application of the column approximation (CA) which assumes basically that the wavelength of the imaging electrons approaches zero.By application of the CA t…
Potentialities and limitations of high-resolution electron microscopy of crystal lattices and their imperfections Open
The resolving power of modern electron microscopes is better than 0.3 nm. This enables images to be formed which show detail at the level of interatomic distances. However the relatively strong scattering of electrons means that when image…