Grain boundary character dependence of oxygen grain boundary diffusion in α-Al2O3 bicrystals

Tsubasa Nakagawa, Hitoshi Nishimura, Isao Sakaguchi, Naoya Shibata, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

We measured oxygen diffusion coefficients (Dgb) along five grain boundaries (GBs) in alumina bicrystals by tracing 18O by secondary ion mass spectrometry. Although all boundaries are classified as coincident site lattice boundaries with relatively ordered structures, Dgb varied up to 103 times among them. On the other hand, the boundaries with identical boundary planes had relatively similar diffusivities as well as similar structures, regardless of Σ values. These results suggest that Dgb are related to GB atomic structures and hence the GB character, especially GB planes.

Original languageEnglish
Pages (from-to)544-547
Number of pages4
JournalScripta Materialia
Volume65
Issue number6
DOIs
Publication statusPublished - 2011 Sep
Externally publishedYes

Keywords

  • Alumina
  • Bicrystal
  • Grain boundary diffusion
  • HREM
  • SIMS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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