Effects of the electric field on the aggregation of point defects in ion-irradiated α-Al2O3

Kazuhiro Yasuda, T. Higuchi, K. Shiiyama, C. Kinoshita, K. Tanaka, M. Kutsuwada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have investigated the effects of an electric field on the formation process of interstitial-type dislocation loops in α-Al2O 3 irradiated at 760 K with 100 keV He+ ions to a damage level of 0.5 displacements per atom. An electric field of 100 kV m-1 depresses the density of dislocation loops and enhances their growth process, compared with the microstructure irradiated without an electric field. In addition, a higher fraction of interstitials escapes to surface sinks in a wedge-shaped thin-foil specimen when irradiated in the presence of an electric field. The kinetic behaviour of interstitials is discussed in terms of diffusion processes driven by the electric field and the concentration gradient. This is the first transmission electron microscopy observation to demonstrate the effects of an electric field on the aggregation of radiation-induced defects in α-Al2O3.

Original languageEnglish
Pages (from-to)21-28
Number of pages8
JournalPhilosophical Magazine Letters
Volume83
Issue number1
DOIs
Publication statusPublished - Jan 1 2003

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point defects
electric fields
interstitials
ions
sinks
wedges
escape
foils
damage
gradients
transmission electron microscopy
microstructure
defects
kinetics
radiation
atoms

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Effects of the electric field on the aggregation of point defects in ion-irradiated α-Al2O3. / Yasuda, Kazuhiro; Higuchi, T.; Shiiyama, K.; Kinoshita, C.; Tanaka, K.; Kutsuwada, M.

In: Philosophical Magazine Letters, Vol. 83, No. 1, 01.01.2003, p. 21-28.

Research output: Contribution to journalArticle

Yasuda, Kazuhiro ; Higuchi, T. ; Shiiyama, K. ; Kinoshita, C. ; Tanaka, K. ; Kutsuwada, M. / Effects of the electric field on the aggregation of point defects in ion-irradiated α-Al2O3. In: Philosophical Magazine Letters. 2003 ; Vol. 83, No. 1. pp. 21-28.
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