STRUCTURAL-CHANGE OF AL-CU-CO DECAGONAL QUASI-CRYSTAL STUDIED BY HIGH-RESOLUTION ELECTRON-MICROSCOPY

被引：80

作者：

HIRAGA, K

SUN, W

LINCOLN, FJ

机构：

[1] Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai

[2] Department of Physical and Inorganic Chemistry, The University of Western Australia, Nedlands, Perth, WA

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1991年 / 30卷 / 2B期

关键词：

DECAGONAL QUASI-CRYSTAL; QUASI-CRYSTAL; PHASE TRANSFORMATION; AL-CU-CO; HIGH-RESOLUTION ELECTRON MICROSCOPY;

D O I：

10.1143/JJAP.30.L302

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We found that the stable decagonal quasicrystal of Al-Cu-Co undergoes a structural change at low temperatures. The Al65Cu15Co20 alloy quenched from 800-degrees-C shows diffraction patterns with sharp spots placed at nearly perfect decagonal symmetry positions, but by annealing at 550-degrees-C the diffraction patterns show a remarkable change in the appearance of diffuse scatterings. High-resolution electron microscopy shows the transformation, at low temperatures, into a partially crystalline structure of a monoclinic unit cell with a = b = 2 nm, c = 0.4 nm and gamma = 108-degrees.

引用

页码：L302 / L305

页数：4

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