Browsing NTNU Open by Journals "Ultramicroscopy"
Now showing items 1-10 of 10
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Analytical transmission cross-coefficients for pink beam X-ray microscopy based on compound refractive lenses
(Journal article; Peer reviewed, 2018)Analytical expressions for the transmission cross-coefficients for x-ray microscopes based on compound refractive lenses are derived based on Gaussian approximations of the source shape and energy spectrum. The effects of ... -
AutomAl 6000: Semi-automatic structural labelling of HAADF-STEM images of precipitates in Al–Mg–Si(–Cu) alloys
(Journal article; Peer reviewed, 2022)When the Al–Mg–Si(–Cu) alloy system is subjected to age hardening, different types of precipitates nucleate depending on the composition and thermomechanical treatment. The main hardening precipitates extend as needles, ... -
Bandgap measurement of high refractive index materials by off-axis EELS
(Journal article; Peer reviewed, 2017)In the present work Cs aberration corrected and monochromated scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) has been used to explore experimental set-ups that allow bandgaps of ... -
Bandgap measurement of high refractive index materials by off-axis EELS
(Journal article; Peer reviewed, 2017)In the present work Cs aberration corrected and monochromated scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) has been used to explore experimental set-ups that allow bandgaps of ... -
Detecting minute amounts of nitrogen in GaNAs thin films using STEM and CBED
(Journal article; Peer reviewed, 2021)Nitrogen (N) is a common element added to GaAs for band gap engineering and strain compensation. However, detection of small amounts of N is difficult for electron microscopy as well as for other chemical analysis techniques. ... -
Effects of atom probe analysis parameters on composition measurement of precipitates in an Al-Mg-Si-Cu alloy
(Peer reviewed; Journal article, 2022)Defining analysis parameter space for reliable composition measurement of materials is of significance for atom probe tomography applications. This research carefully explores the influence of specimen temperature and ... -
Free, flexible and fast: Orientation mapping using the multi-core and GPU-accelerated template matching capabilities in the Python-based open source 4D-STEM analysis toolbox Pyxem
(Peer reviewed; Journal article, 2022)This work presents the new template matching capabilities implemented in Pyxem, an open source Python library for analyzing four-dimensional scanning transmission electron microscopy (4D-STEM) data. Template matching is a ... -
Optimising multi-frame ADF-STEM for high-precision atomic-resolution strain mapping
(Journal article; Peer reviewed, 2017)Annular dark-field scanning transmission electron microscopy is a powerful tool to study crystal defects at the atomic scale but historically single slow-scanned frames have been plagued by low-frequency scanning-distortions ... -
Scanning precession electron diffraction data analysis approaches for phase mapping of precipitates in aluminium alloys
(Peer reviewed; Journal article, 2023)Mapping the spatial distribution of crystal phases with nm-scale spatial resolution is an important characterisation task in studies of multi-phase materials. One popular approach is to use scanning precession electron ... -
Zernike phase contrast in high-energy x-ray transmission microscopy based on refractive optics
(Journal article; Peer reviewed, 2018)The current work represents the first implementation of Zernike phase contrast for compound refractive lens based x-ray microscopy, and also the first successful Zernike phase contrast experiment at photon energies above ...