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Local defect and mid-gap state analysis of GaN using monochromated EELS combined with nanodiffraction and atomic-resolution imaging
Description/Abstract:
Enhancement of energy resolution due to evolution of monochromators has made electron energy loss spectroscopy (EELS) in transmission ele...
Keyword:
4D-STEM
,
ABF-STEM
,
EELS
,
GaN
,
HAADF-STEM
,
HAXPES
, and
defect
Resource Type:
Article
Author:
Shunsuke Yamashita
,
Sei Fukushima
,
Jun Kikkawa
,
Ryoji Arai
,
Yuya Kanitani
,
Koji Kimoto
, and
Yoshihiro Kudo
Journal:
APL Materials
Date Uploaded:
19/03/2024
A Rhombic Dodecahedral Honeycomb Structure with Cation Vacancy Ordering in a !‑Ga2O3 Crystal
Description/Abstract:
Crystal structure of a γ-Ga2O3 layer grown epitaxially on an MgO substrate by a vapor phase transport method was investigated by transmis...
Keyword:
crystal structure
and
gamma-Ga2O3
Resource Type:
Article
Author:
Masanori Mitome
,
Shigemi Kohiki
,
Takuro Nagai
,
Keiji Kurashima
,
Koji Kimoto
, and
Yoshio Bando
Journal:
CRYSTAL GROWTH & DESIGN
Date Uploaded:
05/03/2024
Unsupervised machine learning combined with 4D scanning transmission electron microscopy for bimodal nanostructural analysis
Description/Abstract:
Unsupervised machine learning techniques have been combined with scanning transmission electron microscopy (STEM) to enable comprehensive...
Keyword:
4D-STEM
,
Hierachical Clustering
,
Metallic Glass
,
Non-negative Matrix Factorization
,
Scanning Transmission Electron Microscopy
, and
Unsupervised Machine Learning
Resource Type:
Article
Author:
Koji Kimoto
,
Jun Kikkawa
,
Koji Harano
,
Ovidiu Cretu
,
Yuki Shibazaki
, and
Fumihiko Uesugi
Journal:
Scientific Reports
Date Uploaded:
15/02/2024
Fast electron damage mechanism of epoxy resin studied by electron energy loss spectroscopy and electron diffraction
Description/Abstract:
The damage mechanism and exposure tolerance of epoxy resins to fast electrons remain unclear. We quantitatively investigated the effec...
Keyword:
electron energy loss spectroscopy
,
epoxy resin
,
fast electron damage
, and
π electron
Resource Type:
Article
Author:
Jun Kikkawa
,
Aoi Nii
,
Yoshiaki Sakaniwa
,
Naochika Kon
,
Marina Sakamaki
,
Touyou Ohashi
,
Nobuyasu Nita
,
Koji Harano
, and
Koji Kimoto
Journal:
JOURNAL OF CHEMICAL PHYSICS
Date Uploaded:
01/12/2023
Date Modified:
01/12/2023
Characterization and properties of green-emitting beta-SiAlON : Eu2+ powder phosphors for white light-emitting diodes
Description/Abstract:
This letter reports a b-SiAlON:Eu2+ green phosphor with the composition of Eu0.00296Si0.41395Al0.01334O0.0044N0.56528. The phosphor powde...
Keyword:
LEDs
,
luminescence
,
oxynitride
, and
phosphor
Resource Type:
Article
Author:
Naoto Hirosaki
,
Rong-Jun Xie
,
Koji Kimoto
,
Takashi Sekiguchi
,
Yoshinobu Yamamoto
,
Takayuki Suehiro
, and
Mamoru Mitomo
Date Uploaded:
28/04/2023
Rapid measurement of low-order aberrations using Fourier transforms of crystalline Ronchigrams
Description/Abstract:
The aberrations of the objective lens should be measured and adjusted to realize high spatial resolution in scanning transmission electro...
Keyword:
Aberration
,
Ronchigram
,
STEM
, and
alignment
Resource Type:
Article
Author:
Koji Kimoto
and
Kazuo Ishizuka
Journal:
Ultramicroscopy
Date Uploaded:
02/08/2022
Date Modified:
03/08/2022
Non-negative matrix factorization for mining big data obtained using four-dimensional scanning transmission electron microscopy
Description/Abstract:
Scientific instruments for material characterization have recently been improved to yield big data. For instance, scanning transmission e...
Keyword:
electron microscopy
,
four-dimensional scanning transmission electron microscopy
, and
non-negative matrix factorization
Resource Type:
Article
Author:
Fumihiko Uesugi
,
Shogo Koshiya
,
Jun Kikkawa
,
Takuro Nagai
,
Kazutaka Mitsuishi
, and
Koji Kimoto
Journal:
Ultramicroscopy
Date Uploaded:
02/08/2022
Date Modified:
03/08/2022
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2
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2
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1
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1
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7
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3
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2
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