Free Access
| Issue |
Microsc. Microanal. Microstruct.
Volume 6, Number 1, February 1995
|
|
|---|---|---|
| Page(s) | 149 - 157 | |
| DOI | https://doi.org/10.1051/mmm:1995115 | |
Microsc. Microanal. Microstruct. 6, 149-157 (1995)
DOI: 10.1051/mmm:1995115
In Situ EELS and TEM Observation of Boron
Carbide
Kouhei N. Kushita1, Kiichi Hojou2 et Shigemi Furuno2
1 Department of Radioisotopes, Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan
2 Department of Materials Science and Technology, Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan
2852F - Fusion reactor materials.
7920K - Other electron surface impact phenomena.
6180M - Channelling, blocking and energy loss of particles.
6180J - Ion beam effects.
6140 - Structure of amorphous and polymeric materials.
6470K - Solid solid transitions.
7145G - Exchange, correlation, dielectric and magnetic functions, plasmons.
3520G - Molecular bond strengths, dissociation energies, hydrogen bonding.
Key words
amorphisation -- bonds chemical -- boron compounds -- electron diffraction -- electron energy loss spectra -- fusion reactor materials -- helium ions -- hydrogen ions -- ion beam effects -- plasmons -- positive ions -- transmission electron microscopy -- in situ EELS -- in situ TEM -- ion bombardment -- plasma facing materials -- fusion device -- structural change -- room temperature -- amorphization process -- plasmon loss peak energy -- core loss profiles -- electron diffraction patterns -- sp sup 2 type bonding -- H sub 2 sup + -- He sup + -- 293 K -- H -- He -- B sub 4 C
© EDP Sciences 1995
DOI: 10.1051/mmm:1995115
In Situ EELS and TEM Observation of Boron
Carbide
During Hydrogen-
and Helium-Ion Bombardments
Kouhei N. Kushita1, Kiichi Hojou2 et Shigemi Furuno2 1 Department of Radioisotopes, Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan
2 Department of Materials Science and Technology, Japan Atomic Energy Research Institute Tokai-mura, Naka-gun, Ibaraki-ken, 319-11, Japan
Abstract
Increasing attention has been paid recently to boron
carbide
from a viewpoint of plasma-facing
materials in a fusion device. This paper reports structural
change of 
observed in situ
by EELS and TEM during hydrogen- and helium-ion bombardments
at room temperature. The became amorphous
by the ion bombardments. This amorphization process was presented
as a function of the shift of plasmon-loss peak energy and the
change of core-loss profiles in addition to electron diffraction
patterns. Analysis of core-loss peaks for boron as well as for
carbon in B4C during amorphization process
revealed the formation of 
type bonding
between constituent carbon atoms by the ion bombardments.
2852F - Fusion reactor materials.
7920K - Other electron surface impact phenomena.
6180M - Channelling, blocking and energy loss of particles.
6180J - Ion beam effects.
6140 - Structure of amorphous and polymeric materials.
6470K - Solid solid transitions.
7145G - Exchange, correlation, dielectric and magnetic functions, plasmons.
3520G - Molecular bond strengths, dissociation energies, hydrogen bonding.
Key words
amorphisation -- bonds chemical -- boron compounds -- electron diffraction -- electron energy loss spectra -- fusion reactor materials -- helium ions -- hydrogen ions -- ion beam effects -- plasmons -- positive ions -- transmission electron microscopy -- in situ EELS -- in situ TEM -- ion bombardment -- plasma facing materials -- fusion device -- structural change -- room temperature -- amorphization process -- plasmon loss peak energy -- core loss profiles -- electron diffraction patterns -- sp sup 2 type bonding -- H sub 2 sup + -- He sup + -- 293 K -- H -- He -- B sub 4 C
© EDP Sciences 1995