HAADF-STEM Observation of Partially Ordered Ni<SUB>4</SUB>Mo Alloys

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  • Tanaka Nobuo
    Graduate School of Engineering, Nagoya University
  • Hata Satoshi
    Interdisciplinary Graduate School of Engineering Science, Kyushu University
  • Oki Kensuke
    Interdisciplinary Graduate School of Engineering Science, Kyushu University
  • Kuwano Noriyuki
    Center for Cooperative Research in Advanced Science & Technology, Kyushu University

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  • 部分的に規則化したNi<SUB>4</SUB>Mo合金のHAADF-STEM観察
  • 部分的に規則化したNi4Mo合金のHAADF-STEM観察
  • ブブンテキ ニ キソクカ シタ Ni4Mo ゴウキン ノ HAADF STEM カンサツ

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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=\sqrtCS·λ) 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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