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.
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页码：L302 / L305
页数：4
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