Phason-dynamics studied by quasielastic mossbauer scattering in i-Al-Cu-Fe quasicrystals

被引：10

作者：

Brand, RA ^{[1
]}

Voss, J

Calvayrac, Y

机构：

[1] Gerhard Mercator Univ, Dept Phys, D-47048 Duisburg, Germany

[2] CNRS, Ctr Etud Chim Met, F-94407 Vitry Sur Seine, France

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2000年 / 294卷

关键词：

quasicrystals; phason dynamics;

D O I：

10.1016/S0921-5093(00)01186-2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Quasicrystals can show a new type of localised defect termed a 'phason'. At high temperature, these defects become mobile and lead to short-ranged atomic motion without involving vacancies. Cu in i-Al-Cu-Fe is involved in such phason jump process at high temperatures T on a time scale tau of h/250 mu eV. Surprisingly, tau (Cu) was found independent of the temperature, indicating a type of 'assisted' jump process. In order to investigate the iron dynamics in this system, we have studied i-Al62Cu25.5 Fe-57(12.5) using quasielastic Mossbauer spectroscopy for T less than or equal to 1100 K. We find a temperature-dependent iron phason jump process with tau (Fe) typically two orders of magnitude slower than copper. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：666 / 669

页数：4