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Oxygen Diffusion along Symmetric [0001] Tilt Grain Boundaries in α-Alumina

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Abstract:

Grain boundary diffusion coefficients of oxygen (δDgb) at 1793K in high purity α-alumina bicrystals with Σ7{2 _ ,310}/[0001] and Σ31{7 _ ,1140}/[0001] symmetric tilt grain boundaries were measured by means of the isotopic exchange and diffusion depth profiling using SIMS. δDgb of both grain boundaries were determined to be 7.1x10-24 [m3/sec] for Σ7 grain boundary and 5.3 x10-24 [m3/sec] for Σ31 grain boundary, respectively. These results indicate that Σ values do not directly relate to grain boundary diffusion properties.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

415-418

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.415

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Online since:

August 2006

Authors:

Tsubasa Nakagawa, Isao Sakaguchi, Katsuyuki Matsunaga, Takahisa Yamamoto, Hajime Haneda, Yuichi Ikuhara

Keywords:

Alumina Bicrystal, Diffusion Profiling, Grain Boundary Diffusion, Isotopic Exchange, SIMS

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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