Scanning transmission electron microscopy: Seeing the atoms more clearly

MRS Bulletin ◽  
2012 ◽  
Vol 37 (10) ◽  
pp. 943-951 ◽  
Author(s):  
Stephen J. Pennycook
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Image Position

Abstract

Periodic Cation Segregation in Cs0.44[Nb2.54W2.46O14] Quantified by High-Resolution Scanning Transmission Electron Microscopy

2014 ◽  
Vol 20 (5) ◽  
pp. 1453-1462 ◽  
Author(s):  
Markus Heidelmann ◽  
Juri Barthel ◽  
Gerhard Cox ◽  
Thomas E. Weirich
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Intensity Variation ◽  
Unit Cell ◽  
M1 Phase ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Image Position

AbstractThe atomic structure of Cs0.44[Nb2.54W2.46O14] closely resembles the structure of the most active catalyst for the synthesis of acrylic acid, the M1 phase of ${\rm Mo}_{{{\rm 10}}} {\rm V}_{{\rm 2}}^{{{\rm 4{\plus}}}} {\rm Nb}_{2} {\rm TeO}_{{{\rm 42}{\minus}x}} $ . Consistently with observations made for the latter compound, the high-angle electron scattering signal recorded by scanning transmission electron microscopy shows a significant intensity variation, which repeats periodically with the projected crystallographic unit cell. The occupation factors for the individual mixed Nb/W atomic columns are extracted from the observed intensity variations. For this purpose, experimental images and simulated images are compared on an identical intensity scale, which enables a quantification of the cation distribution. According to our analysis specific sites possess low tungsten concentrations of 25%, whereas other sites have tungsten concentrations above 70%. These findings allow us to refine the existing structure model of the target compound, which has until now described a uniform distribution of the niobium and tungsten atoms in the unit cell, showing that the similarity between Cs0.44[Nb2.54W2.46O14] and the related catalytic compounds also extends to the level of the cation segregation.

scholarly journals In situ electrochemical scanning/transmission electron microscopy of electrode–electrolyte interfaces

MRS Bulletin ◽  
2020 ◽  
Vol 45 (9) ◽  
pp. 738-745
Author(s):  
Raymond R. Unocic ◽  
Katherine L. Jungjohann ◽  
B. Layla Mehdi ◽  
Nigel D. Browning ◽  
Chongmin Wang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Image Position

Abstract

Lab on a beam—Big data and artificial intelligence in scanning transmission electron microscopy

MRS Bulletin ◽  
2019 ◽  
Vol 44 (7) ◽  
pp. 565-575 ◽  
Author(s):  
Sergei V. Kalinin ◽  
Andrew R. Lupini ◽  
Ondrej Dyck ◽  
Stephen Jesse ◽  
Maxim Ziatdinov ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Big Data ◽  
Scanning Transmission Electron Microscopy ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Image Position

Abstract

Scanning Transmission Electron Microscopy of Polyethylene Crystals

1980 ◽  
Vol 38 ◽  
pp. 242-245
Author(s):  
F. Khoury ◽  
L. H. Bolz
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallization Temperature ◽  
Scanning Transmission Electron Microscopy ◽  
Growth Habit ◽  
Lateral Growth ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Growth Habits

The lateral growth habits and non-planar conformations of polyethylene crystals grown from dilute solutions (<0.1% wt./vol.) are known to vary depending on the crystallization temperature.1-3 With the notable exception of a study by Keith2, most previous studies have been limited to crystals grown at <95°C. The trend in the change of the lateral growth habit of the crystals with increasing crystallization temperature (other factors remaining equal, i.e. polymer mol. wt. and concentration, solvent) is illustrated in Fig.l. The lateral growth faces in the lozenge shaped type of crystal (Fig.la) which is formed at lower temperatures are {110}. Crystals formed at higher temperatures exhibit 'truncated' profiles (Figs. lb,c) and are bound laterally by (110) and (200} growth faces. In addition, the shape of the latter crystals is all the more truncated (Fig.lc), and hence all the more elongated parallel to the b-axis, the higher the crystallization temperature.

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