scholarly journals Stimulation of use of in-situ experiments in high voltage electron microscopes in advancing science and technology

1993 ◽  
Vol 4 (2-3) ◽  
pp. 101-110 ◽  
Author(s):  
Toru Imura
Keyword(s):  
High Voltage ◽  
Science And Technology ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
In Situ Experiments ◽  
Electron Microscopes ◽  
Stimulation Of

In-situ studies in the high-voltage Electron Microscope

1990 ◽  
Vol 48 (4) ◽  
pp. 504-505
Author(s):  
K.H. Westmacott
Keyword(s):  
Phase Transitions ◽  
High Voltage ◽  
Bulk Material ◽  
Outer Region ◽  
High Energy ◽  
Research Areas ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
Electron Microscopes

The principal advantages of high voltage electron microscopes are the ability to 1) attain higher resolution by virtue of the shorter wavelength, and 2) penetrate thicker specimens to observe dynamic behavior representative of bulk material. Some recent examples of in-situ HVEM research, representing the latter category, will be summarized in this contribution, and future directions discussed. Included in the most active research areas are phase transitions, deformation, high temperature reactions and environmental cell studies.Irradiation with high energy electrons in an HVEM provides a convenient alternative to thermal treatments for inducing phase transitions in alloys. An illustration of how ordering or disordering of the same material can occur under electron irradiation is shown in Figure 1. In this example, a Pt7C ordered phase was formed in a Pt-C alloy at 500°C with a defocused beam (outer region) and subsequently disordered at 30°C with a focussed beam (inner spot).

scholarly journals New Approach to In Situ Observation Experiments under Irradiation in High Voltage Electron Microscopes

2014 ◽  
Vol 55 (3) ◽  
pp. 423-427 ◽  
Author(s):  
Hiroaki Abe ◽  
Takahiro Ishizaki ◽  
Feng Li ◽  
Sho Kano ◽  
Yanfen Li ◽  
...  
Keyword(s):  
High Voltage ◽  
New Approach ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
Electron Microscopes

In-situ electrical-resistivity measurements in the high-voltage electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 68-69
Author(s):  
W. E. King
Keyword(s):  
Electrical Resistivity ◽  
Electron Microscope ◽  
High Voltage ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Wide Range ◽  
Helium Gas

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).

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