HAADF-STEM observation of partially ordered Ni4Mo alloys

N. Tanaka, Satoshi Hata, K. Oki, N. Kuwano

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Partially ordered Ni4Mo alloys were observed for the first time at an atomic resolution with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The Mo atomic columns in the D1a ordered structure were clearly visualized as bright square dots in the HAADF-STEM image. It was found that the ordered regions were observed with a high contrast in the defocus condition a little overfocused from the Scherzer defocus (Δf = √CS · γ) which is the condition for the smallest electron probe in STEM. The phenomenon was interpreted successfully by using the approximate imaging theory for HAADF-STEM proposed by Jesson et al. Using the present experimental and simulation results, an approximate imaging theory for visualizing short range ordered state in binary alloys, such as the Ni4Mo alloys, is proposed.

Original languageEnglish
Pages (from-to)414-418
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume65
Issue number5
DOIs
Publication statusPublished - Jan 1 2001

Fingerprint

Transmission electron microscopy
transmission electron microscopy
Scanning electron microscopy
scanning electron microscopy
Imaging techniques
Binary alloys
electron probes
binary alloys
Electrons
simulation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

HAADF-STEM observation of partially ordered Ni4Mo alloys. / Tanaka, N.; Hata, Satoshi; Oki, K.; Kuwano, N.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 65, No. 5, 01.01.2001, p. 414-418.

Research output: Contribution to journalArticle

@article{62c6a5123f964cadbcc1c909b705afe7,
title = "HAADF-STEM observation of partially ordered Ni4Mo alloys",
abstract = "Partially ordered Ni4Mo alloys were observed for the first time at an atomic resolution with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The Mo atomic columns in the D1a ordered structure were clearly visualized as bright square dots in the HAADF-STEM image. It was found that the ordered regions were observed with a high contrast in the defocus condition a little overfocused from the Scherzer defocus (Δf = √CS · γ) which is the condition for the smallest electron probe in STEM. The phenomenon was interpreted successfully by using the approximate imaging theory for HAADF-STEM proposed by Jesson et al. Using the present experimental and simulation results, an approximate imaging theory for visualizing short range ordered state in binary alloys, such as the Ni4Mo alloys, is proposed.",
author = "N. Tanaka and Satoshi Hata and K. Oki and N. Kuwano",
year = "2001",
month = "1",
day = "1",
doi = "10.2320/jinstmet1952.65.5_414",
language = "English",
volume = "65",
pages = "414--418",
journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
issn = "0021-4876",
publisher = "公益社団法人 日本金属学会",
number = "5",

}

TY - JOUR

T1 - HAADF-STEM observation of partially ordered Ni4Mo alloys

AU - Tanaka, N.

AU - Hata, Satoshi

AU - Oki, K.

AU - Kuwano, N.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Partially ordered Ni4Mo alloys were observed for the first time at an atomic resolution with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The Mo atomic columns in the D1a ordered structure were clearly visualized as bright square dots in the HAADF-STEM image. It was found that the ordered regions were observed with a high contrast in the defocus condition a little overfocused from the Scherzer defocus (Δf = √CS · γ) which is the condition for the smallest electron probe in STEM. The phenomenon was interpreted successfully by using the approximate imaging theory for HAADF-STEM proposed by Jesson et al. Using the present experimental and simulation results, an approximate imaging theory for visualizing short range ordered state in binary alloys, such as the Ni4Mo alloys, is proposed.

AB - Partially ordered Ni4Mo alloys were observed for the first time at an atomic resolution with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The Mo atomic columns in the D1a ordered structure were clearly visualized as bright square dots in the HAADF-STEM image. It was found that the ordered regions were observed with a high contrast in the defocus condition a little overfocused from the Scherzer defocus (Δf = √CS · γ) which is the condition for the smallest electron probe in STEM. The phenomenon was interpreted successfully by using the approximate imaging theory for HAADF-STEM proposed by Jesson et al. Using the present experimental and simulation results, an approximate imaging theory for visualizing short range ordered state in binary alloys, such as the Ni4Mo alloys, is proposed.

UR - http://www.scopus.com/inward/record.url?scp=0034932975&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034932975&partnerID=8YFLogxK

U2 - 10.2320/jinstmet1952.65.5_414

DO - 10.2320/jinstmet1952.65.5_414

M3 - Article

VL - 65

SP - 414

EP - 418

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 5

ER -