Induced Amorphization in Pyrographite by Radiation Using High Voltage Transmission Electron Microscope

2011 ◽  
Vol 284-286 ◽  
pp. 2026-2036 ◽  
Author(s):  
Pedro Alejandro Tamayo Meza ◽  
Pablo Schabes Retchkiman ◽  
Luis Armando Flores Herrera ◽  
Viacheslav A. Yermishkin ◽  
Carlos F. Ordáz Yañez ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
High Voltage ◽  
Electron Irradiation ◽  
High Dose ◽  
Natural Graphite ◽  
Transmission Electron ◽  
High Voltage Transmission ◽  
Vacancy Concentrations

A high dose of electron irradiation generates amorphous zones with critical vacancy concentrations in the pyrographite. The degree of disorder “” of amorphization of Graphite, natural graphite, pyrographite and polycrystal pyrographite are analyzed as a function of time “t”, and the amorphization kinetics under different voltages inside the HVTEM.

High-voltage Transmission Electron Microscope in situ Study on Dislocation Motion in Decagonal Al–Ni–Co Single Quasicrystals

2005 ◽  
Vol 20 (7) ◽  
pp. 1814-1824 ◽  
Author(s):  
Martin Bartsch ◽  
Peter Schall ◽  
Michael Feuerbacher ◽  
Ulrich Messerschmidt
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
High Voltage ◽  
Activation Parameters ◽  
Dislocation Motion ◽  
Transmission Electron ◽  
Macroscopic Deformation ◽  
Icosahedral Quasicrystals ◽  
High Voltage Transmission

Decagonal single quasicrystals of the composition Al70Ni15Co15have been deformed in situ in a high-voltage transmission electron microscope at 730 °C along the 10-fold periodic axis to directly observe the dislocation motion. The deformation is carried by stress-assisted climb of dislocations with periodic Burgers vectors. These dislocations may also glide and move by a combination of glide and climb. Dislocations with Burgers vectors with components in the periodic and quasiperiodic directions probably move under the action of a chemical force. The observations are interpreted by a model established by P. Schall et al. under consideration of the activation parameters of macroscopic deformation and by analogies with the behavior of icosahedral quasicrystals.

scholarly journals Development of Novel Optical Fiber System for Cathodoluminescence Detection in High Voltage Transmission Electron Microscope

2013 ◽  
Vol 54 (5) ◽  
pp. 854-856 ◽  
Author(s):  
Kenichiro Furumoto ◽  
Tetsuo Tanabe ◽  
Naoji Yamamoto ◽  
Takeshi Daio ◽  
Syo Matsumura ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Optical Fiber ◽  
Transmission Electron Microscope ◽  
High Voltage ◽  
Fiber System ◽  
Transmission Electron ◽  
High Voltage Transmission
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