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

We measured oxygen diffusion coefficients (D sub(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, Dgb varied up to 10 super(...

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Published in:Scripta materialia 2011-09, Vol.65 (6), p.544-547
Main Authors: Nakagawa, Tsubasa, Nishimura, Hitoshi, Sakaguchi, Isao, Shibata, Naoya, Matsunaga, Katsuyuki, Yamamoto, Takahisa, Ikuhara, Yuichi
Format: Article
Language:English
Subjects:
Aluminum oxide
Bicrystals
Boundaries
Diffusion coefficient
Grain boundaries
Grain boundary diffusion
Lattices
Secondary ion mass spectrometry
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container_title Scripta materialia
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creator Nakagawa, Tsubasa
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description We measured oxygen diffusion coefficients (D sub(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, Dgb varied up to 10 super(3) times among them. On the other hand, the boundaries with identical boundary planes had relatively similar diffusivities as well as similar structures, regardless of capital sigma values. These results suggest that D sub(gb) are related to GB atomic structures and hence the GB character, especially GB planes.
doi_str_mv 10.1016/j.scriptamat.2011.06.024
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subjects Aluminum oxide
Bicrystals
Boundaries
Diffusion coefficient
Grain boundaries
Grain boundary diffusion
Lattices
Secondary ion mass spectrometry
title Grain boundary character dependence of oxygen grain boundary diffusion in α-Al2O3 bicrystals
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