Surface layer self diffusion in icosahedral Al-Pd-Mn quasicrystals

被引：7

作者：

Samavat, F. ^{[1
,2
]}

Gladys, M. J. ^{[1
]}

Jenks, C. J. ^{[3
]}

Lograsso, T. A. ^{[3
]}

King, B. V. ^{[1
]}

O'Connor, D. J. ^{[1
]}

机构：

[1] Univ Newcastle, Sch Math & Phys Sci, Callaghan, NSW 2308, Australia

[2] Bu Ali Sina Univ, Dept Phys, Hamadan, Iran

[3] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 24期

基金：

澳大利亚研究理事会;

关键词：

diffusion; aluminum; palladium; manganese; quasicrystals; low energy ion scattering (LEIS); Al-Pd-Mn; metallic surfaces;

D O I：

10.1016/j.susc.2007.06.043

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：

The self diffusion of Mn and Pd in a single grain icosahedral Al69.9Pd20.5Mn9.6 quasicrystal has been determined by low energy ion scattering (LEIS). The diffusion was determined by depositing different elements (Pd, Mn) on the surface and measuring the rate of change in surface composition as a function of temperature by LEIS. The surface composition was monitored over the temperature range of 355-575 K for Mn and 440-745 K for Pd and compared to model calculations to allow the activation energy for diffusion to be determined. Activation energies of 0.20 +/- 0.01 eV for Mn and 0.64 +/- 0.03 eV for Pd have then been measured for self diffusion in i-Al-Pd-Mn, respectively. No deviation from Arrhenius behavior was detected in the temperature range covered by the present experiments. From the low values of activation energy we propose that this range of diffusion is phason related, reflecting the specific nature of the icosahedral structure. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：5678 / 5682

页数：5

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