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.

引用

页码：L671 / L674

页数：4

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