High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys

N. Tanaka, N. Suzuki, M. Kawasaki, Satoshi Hata, N. Kuwano, K. Oki

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Atomic structures of partially ordered Ni-19.5at%Mo alloys are, for the first time, studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The small ordered regions with a D1a structure are clearly visualized as the square-arrangement of bright clots corresponding to the Mo-atomic columns in the dark background due to the disordered matrix with a fcc structure. The variation of the image contrast, where the D1a structure is visualized with high contrast in overfocused conditions from the Scherzer defocus, is observed, which is interpreted by using the approximate imaging theory by Jesson et al. and the size-variation of the probe. The imaging theory for the HAADF-STEM of short-range ordered state in binary alloys is formulated, where the dynamical diffraction effect is reduced in comparison with that for transmission electron microscopy (TEM).

Original languageEnglish
JournalJournal De Physique. IV : JP
Volume10
Issue number6
Publication statusPublished - Jan 1 2000
EventJFMSS-6: 6th Japan-France Materials Science Seminar 'Microstructural Design for Improved Mechanical Bahaviour of Advanced Materials' - Poitiers, France
Duration: Oct 4 1999Oct 6 1999

Fingerprint

Transmission electron microscopy
transmission electron microscopy
Imaging techniques
Scanning electron microscopy
scanning electron microscopy
Binary alloys
image contrast
binary alloys
atomic structure
Diffraction
probes
matrices
diffraction

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Tanaka, N., Suzuki, N., Kawasaki, M., Hata, S., Kuwano, N., & Oki, K. (2000). High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys. Journal De Physique. IV : JP, 10(6).

High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys. / Tanaka, N.; Suzuki, N.; Kawasaki, M.; Hata, Satoshi; Kuwano, N.; Oki, K.

In: Journal De Physique. IV : JP, Vol. 10, No. 6, 01.01.2000.

Research output: Contribution to journalConference article

Tanaka, N, Suzuki, N, Kawasaki, M, Hata, S, Kuwano, N & Oki, K 2000, 'High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys', Journal De Physique. IV : JP, vol. 10, no. 6.
Tanaka, N. ; Suzuki, N. ; Kawasaki, M. ; Hata, Satoshi ; Kuwano, N. ; Oki, K. / High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys. In: Journal De Physique. IV : JP. 2000 ; Vol. 10, No. 6.
@article{8be18cf3493c47bb860231c25a2cf35f,
title = "High-angle annular dark-field STEM of partially ordered Ni-19.5at{\%}Mo alloys",
abstract = "Atomic structures of partially ordered Ni-19.5at{\%}Mo alloys are, for the first time, studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The small ordered regions with a D1a structure are clearly visualized as the square-arrangement of bright clots corresponding to the Mo-atomic columns in the dark background due to the disordered matrix with a fcc structure. The variation of the image contrast, where the D1a structure is visualized with high contrast in overfocused conditions from the Scherzer defocus, is observed, which is interpreted by using the approximate imaging theory by Jesson et al. and the size-variation of the probe. The imaging theory for the HAADF-STEM of short-range ordered state in binary alloys is formulated, where the dynamical diffraction effect is reduced in comparison with that for transmission electron microscopy (TEM).",
author = "N. Tanaka and N. Suzuki and M. Kawasaki and Satoshi Hata and N. Kuwano and K. Oki",
year = "2000",
month = "1",
day = "1",
language = "English",
volume = "10",
journal = "European Physical Journal: Special Topics",
issn = "1951-6355",
publisher = "Springer Verlag",
number = "6",

}

TY - JOUR

T1 - High-angle annular dark-field STEM of partially ordered Ni-19.5at%Mo alloys

AU - Tanaka, N.

AU - Suzuki, N.

AU - Kawasaki, M.

AU - Hata, Satoshi

AU - Kuwano, N.

AU - Oki, K.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Atomic structures of partially ordered Ni-19.5at%Mo alloys are, for the first time, studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The small ordered regions with a D1a structure are clearly visualized as the square-arrangement of bright clots corresponding to the Mo-atomic columns in the dark background due to the disordered matrix with a fcc structure. The variation of the image contrast, where the D1a structure is visualized with high contrast in overfocused conditions from the Scherzer defocus, is observed, which is interpreted by using the approximate imaging theory by Jesson et al. and the size-variation of the probe. The imaging theory for the HAADF-STEM of short-range ordered state in binary alloys is formulated, where the dynamical diffraction effect is reduced in comparison with that for transmission electron microscopy (TEM).

AB - Atomic structures of partially ordered Ni-19.5at%Mo alloys are, for the first time, studied by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The small ordered regions with a D1a structure are clearly visualized as the square-arrangement of bright clots corresponding to the Mo-atomic columns in the dark background due to the disordered matrix with a fcc structure. The variation of the image contrast, where the D1a structure is visualized with high contrast in overfocused conditions from the Scherzer defocus, is observed, which is interpreted by using the approximate imaging theory by Jesson et al. and the size-variation of the probe. The imaging theory for the HAADF-STEM of short-range ordered state in binary alloys is formulated, where the dynamical diffraction effect is reduced in comparison with that for transmission electron microscopy (TEM).

UR - http://www.scopus.com/inward/record.url?scp=0033749663&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033749663&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0033749663

VL - 10

JO - European Physical Journal: Special Topics

JF - European Physical Journal: Special Topics

SN - 1951-6355

IS - 6

ER -