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

doi:10.1016/j.scriptamat.2011.06.024

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 journal › Article › peer-review

24 Citations (Scopus)

Abstract

We measured oxygen diffusion coefficients (D_gb) 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, D_gb 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 D_gb are related to GB atomic structures and hence the GB character, especially GB planes.

Original language	English
Pages (from-to)	544-547
Number of pages	4
Journal	Scripta Materialia
Volume	65
Issue number	6
DOIs	https://doi.org/10.1016/j.scriptamat.2011.06.024
Publication status	Published - 2011 Sep 1

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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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.",

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AU - Nakagawa, Tsubasa

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AU - Sakaguchi, Isao

AU - Shibata, Naoya

AU - Matsunaga, Katsuyuki

AU - Yamamoto, Takahisa

AU - Ikuhara, Yuichi

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AB - 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.

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