scholarly journals New capabilities for `colouring in' the chemistry of crystal defects atom-by-atom

2014 ◽  
Vol 70 (6) ◽  
pp. 521-523
Author(s):  
Sarah J. Haigh
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Crystal Defects ◽  
Energy Dispersive ◽  
Acta Cryst ◽  
X Ray ◽  
Elemental Imaging ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Electron Microscopes

The latest generation of scanning transmission electron microscopes equipped with high-efficiency energy-dispersive X-ray detectors are breaking new ground with respect to high-resolution elemental imaging of materials. In this issue, Paulauskaset al.[Acta Cryst.(2014), A70, 524–531] demonstrate impressive results when applying this technique to improve understanding of CdTe dislocation structures.

Energy-dispersive x-ray detectors for analytical electron microscopy

1991 ◽  
Vol 49 ◽  
pp. 986-987
Author(s):  
L. E. Thomas
Keyword(s):  
Collection Efficiency ◽  
Analytical Electron Microscopy ◽  
Energy Dispersive ◽  
Detector Performance ◽  
X Ray ◽  
Performance Improvements ◽  
Transmission Electron ◽  
Analytical Electron ◽  
Scanning Transmission ◽  
Electron Microscopes

Continuing evolution of energy-dispersive x-ray spectrometer (EDS) systems has greatly advanced x-ray detector performance in analytical electron microscopes. The latest detectors offer improved energy resolution, count rate performance, geometrical collection efficiency, durability, and efficiency for light and heavy elements. Innovative detector designs for transmission and scanning transmission electron microscopes (TEM/STEMs) include such features as liquid-nitrogen-free operation, in situ de-icing of the detector crystal, user cleanable windows, demountable windows, ultrahigh vacuum compatibility (including adaptations to allow microscope bakeouts without removing the detector), beam damage protection, and microscope interfaces with optimized collection geometries. Divergent design philosophies have produced a variety of systems with specialized features, and users may face hard choices in selecting the best detector for the job. The aim of this paper is to review the current state of EDS detector development and the importance of the performance improvements to TEM/STEM users.

A Study of Grain Boundaries in High TC Superconducting Yba2Cu3O7-x Thin Films Using High Resolution Analytical Stem

1989 ◽  
Vol 169 ◽  
Author(s):  
D. H. Shin ◽  
J. Silcox ◽  
S. E. Russek ◽  
D. K. Lathrop ◽  
R. A. Buhrman
Keyword(s):  
Thin Films ◽  
High Resolution ◽  
Grain Boundaries ◽  
Scanning Transmission Electron Microscope ◽  
Atomic Resolution ◽  
High Tc ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Edx Microanalysis

AbstractGrain boundaries in thin films of high Tc YBa2Cu3O7-x superconductors have been investigated with high resolution scanning transmission electron microscope (STEM) imaging and nanoprobe energy dispersive x-ray (EDX) analysis. Atomic resolution images indicate that the grain boundaries are mostly clean, i.e., free of a boundary layer of different phase or of segregation, and are often coherent. EDX microanalysis with a 10 Å spatial resolution also indicates no composition deviation at the grain boundaries.

Design of 2D-nanocrystals in water: preparation, structure and functionalization

2018 ◽  
Vol 90 (5) ◽  
pp. 833-844
Author(s):  
Leonid Aslanov ◽  
Valery Zakharov ◽  
Ksenia Paseshnichenko ◽  
Aleksandr Yatsenko ◽  
Andrey Orekhov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Chemical Composition ◽  
High Resolution ◽  
Electron Diffraction ◽  
Single Crystal ◽  
Room Temperature ◽  
Energy Dispersive ◽  
X Ray ◽  
Transmission Electron

AbstractA new method for synthesis of 2D nanocrystals in water was proposed. The use of perfluorothiophenolate ions as surfactant allowed us to produce 2D single-crystal nanosheets of CaS at pH=9 and flat nanocrystals of PbS at pH=9 at room temperature. Mesocrystalline nanobelts of CdS and mesocrystals of PbS were obtained at pH=3–5 and pH=10–12, respectively. Morphology, structure and chemical composition of nanoparticles were characterized by high-resolution transmission electron microscopy, electron diffraction and energy dispersive X-ray spectroscopy. A mechanism of nanoparticles formation was discussed.

Quantification in Elemental DIstributions of Light Atoms by EEL Image Analysis in Biological Sections

1982 ◽  
Vol 40 ◽  
pp. 420-423
Author(s):  
F. P. Ottensmeyer
Keyword(s):  
Elemental Content ◽  
Single Element ◽  
X Ray ◽  
Transmission Electron ◽  
Spectral Evaluation ◽  
Scanning Transmission ◽  
Spectrum Characteristic ◽  
Electron Microscopes ◽  
Electron Energy Loss ◽  
Magnetic Electron

Microanalysis by electron energy loss spectroscopy has gained momentum in the last few years with the utilization of more and more magnetic electron spectrometers coupled to dedicated or hybrid scanning transmission electron microscopes. Two approaches to analysis are the spectral evaluation of a single spot and the mapping of a single element over the entire image. In the first method, as in x-ray microanalysis, a finely focused electron beam is placed on a small area of the specimen. The impinging electrons traversing this spot subsequently provide a spectrum characteristic of the elemental content of the area.

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