First low-temperature radiotracer studies of diffusion in icosahedral quasicrystals

被引：72

作者：

Bluher, R

Scharwaechter, P

Frank, W

Kronmuller, H

机构：

[1] Univ Stuttgart, D-70569 Stuttgart, Germany

[2] Max Planck Inst Met Forsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.80.1014

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The diffusivities of implanted, radioactive Pd-103 and Au-195 in icosahedral Al70.4Pd20.8Mn8.8 quasicrystals were measured between 810 and 270 degrees C by a radiotracer technique, where serial sectioning was done by high-precision grinding or ion-beam sputtering. Both diffusion coefficients obey different Arrhenius laws above and below 450 degrees C. Whereas diffusion above this temperature is explained in terms of a vacancy mechanism that reflects the heterogeneity of the icosahedral structure, diffusion below 450 degrees C is proposed to occur via a phason-assisted direct mechanism.

引用

页码：1014 / 1017

页数：4

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