A new crystalline phase related to an Al-Ni-Co decagonal phase

被引：15

作者：

Hiraga, K ^{[1
]}

Ohsuna, T ^{[1
]}

Nishimura, S ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 325卷 / 1-2期

关键词：

quasicrystal; decagonal quasicrystal; crystalline approximant; AI-Ni-Co; transmission electron microscopy;

D O I：

10.1016/S0925-8388(01)01364-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new crystalline phase (called 'W-(AlNiCo) phase'), which is closely related to Al-Ni-Co decagonal quasicrystals with 0.4 nm and 0.8 nm periodicity, has been found in an Al72.5Ni7.5Co20 alloy annealed at 950 degreesC. The W-(AlNiCo) phase has a monoclinic structure with lattice parameters a=3.99 nm, b=0.82 nm, c=2.36 nm and beta =90 degrees, and the space group of Cm (No. 8). Structural characteristics of the W-(AlNiCo) phase and the resemblance to those of an Al-Ni-Co pentagonal quasicrystal are discussed from atom-scale observations using high-angle annular detector dark-held scanning transmission electron microscopy and high-resolution electron transmission microscopy. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：145 / 150

页数：6

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