HAADF-STEM observation of partially ordered Ni4Mo alloys

N. Tanaka; S. Hata; K. Oki; N. Kuwano

doi:10.2320/jinstmet1952.65.5_414

HAADF-STEM observation of partially ordered Ni₄Mo alloys

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

Research output: Contribution to journal › Article

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 D1_a 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 = √C_S · 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 language	English
Pages (from-to)	414-418
Number of pages	5
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	65
Issue number	5
DOIs	https://doi.org/10.2320/jinstmet1952.65.5_414
Publication status	Published - Jan 1 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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Tanaka, N., Hata, S., Oki, K., & Kuwano, N. (2001). HAADF-STEM observation of partially ordered Ni₄Mo alloys. Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 65(5), 414-418. https://doi.org/10.2320/jinstmet1952.65.5_414

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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.",

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