Structural study of an Al72Ni20Co8 decagonal quasicrystal using the high-angle annular dark-field method

被引：80

作者：

Saitoh, K

Tsuda, K

Tanaka, M

Kaneko, K

Tsai, AP

机构：

[1] JAPAN SCI & TECHNOL CORP, INT COOPERAT RES PROJECT CERAM SUPERPLAST, JAPAN FINE CERAM CTR 2F, NAGOYA, AICHI 456, JAPAN

[2] NATL RES INST MET, TSUKUBA, IBARAKI 305, JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1997年 / 36卷 / 10B期

关键词：

decagonal quasicrystal; approximant; high-angle annular dark-field image; Z-contrast imaging; scanning transmission electron microscopy;

D O I：

10.1143/JJAP.36.L1400

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 an Al72Ni20Co8 decagonal quasicrystal have been taken for the first time. It has been found that the transition metals form pentagonal and star-shaped cluster columns with radii of about 0.4 nm. The atom-cluster columns with a 2 nm diameter of the alloy, which have been considered as the basic structural unit with decagonal symmetry so far, have been revealed to have no decagonal symmetry. These atom-cluster columns have been found to be decomposed into the pentagonal and star-shaped cluster columns, corresponding clusters existing in the Al13Fe4 monoclinic approximant. The tiling of the pentagonal and star-shaped clusters has been found to agree with the rhombic Penrose lattice for an area with a diameter greater than 50 nm.

引用

页码：L1400 / L1402

页数：3

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