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

26 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

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

Access to Document

10.1016/j.scriptamat.2011.06.024

Cite this

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title = "Grain boundary character dependence of oxygen grain boundary diffusion in α-Al2O3 bicrystals",

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.",

keywords = "Alumina, Bicrystal, Grain boundary diffusion, HREM, SIMS",

author = "Tsubasa Nakagawa and Hitoshi Nishimura and Isao Sakaguchi and Naoya Shibata and Katsuyuki Matsunaga and Takahisa Yamamoto and Yuichi Ikuhara",

note = "Funding Information: A part of this study was supported by a Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic Scale Modification 474” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. The authors wish to thank Prof. A.H. Heuer of Case Western Reserve University for his careful reading of this manuscript and useful comments.",

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T1 - Grain boundary character dependence of oxygen grain boundary diffusion in α-Al2O3 bicrystals

AU - Nakagawa, Tsubasa

AU - Nishimura, Hitoshi

AU - Sakaguchi, Isao

AU - Shibata, Naoya

AU - Matsunaga, Katsuyuki

AU - Yamamoto, Takahisa

AU - Ikuhara, Yuichi

N1 - Funding Information: A part of this study was supported by a Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic Scale Modification 474” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. The authors wish to thank Prof. A.H. Heuer of Case Western Reserve University for his careful reading of this manuscript and useful comments.

PY - 2011/9

Y1 - 2011/9

N2 - 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.

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.

KW - Alumina

KW - Bicrystal

KW - Grain boundary diffusion

KW - HREM

KW - SIMS

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