One-dimensional fast migration of vacancy clusters in metals

Yoshitaka Matsukawa, Steven J. Zinkle

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)

Abstract

The migration of point defects, for example, crystal lattice vacancies and self-interstitial atoms (SIAs), typically occurs through three-dimensional random walk in crystalline solids. However, when vacancies and SIAs agglomerate to form planar clusters, the migration mode may change. We observed nanometer-sized clusters of vacancies exhibiting one-dimensional (1D) fast migration. The 1D migration transported a vacancy cluster containing several hundred vacancies with a mobility higher than that of a single vacancy random walk and a mobility comparable to a single SIA random walk. Moreover, we found that the 1D migration may be a key physical mechanism for self-organization of nanometer-sized sessile vacancy cluster (stacking fault tetrahedron) arrays. Harnessing this 1D migration mode may enable new control of defect microstructures such as effective defect removal and introduction of ordered nanostructures in materials, including semiconductors.

Original languageEnglish
Pages (from-to)959-962
Number of pages4
JournalScience
Volume318
Issue number5852
DOIs
Publication statusPublished - 2007 Nov 2

ASJC Scopus subject areas

  • General

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