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Structural study of an Al70Ni15Fe15 decagonal quasicrystal using high-angle annular dark-field scanning transmission electron microscopy
被引：18
|作者：
Saitoh, K
Tsuda, K
Tanaka, M
Tsai, AP
机构：
[1] Tohoku Univ, Sci Measurements Res Inst, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
|
1999年
/
38卷
/
6AB期
关键词：
decagonal quasicrystal;
fivefold atom-cluster;
inversion domain;
antiphase domain;
tau(2)-Al13Co4 approximant;
high-angle annular dark-field imaging;
Z-contrast imaging;
D O I：
10.1143/JJAP.38.L671
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
High-angle annular dark-field (HAADF) images of a melt-quenched Al70Ni15Fe15 decagonal quasicrystal have been taken using a scanning transmission electron microscope for the first time. We have found that the alloy is composed of 2-nm-diameter atom clusters with fivefold symmetry. We have also observed an inversion domain structure. A structural model has been constructed on the basis of the HAADF images and the fivefold cluster of the monoclinic tau(2)-Al13Co4 approximant model [Saitoh et al: J, Electron Microsc. 48 (1999) 105]. Antiphase shifts at domain boundaries have been observed directly for the first time. The present observation has verified the results of high-resolution electron microscopy (HREM) and the dark-field imaging technique obtained by Tsuda et al.
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页码：L671 / L674
页数：4
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