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Philosophical Magazine Letters Volume 90, 2010 - Issue 8
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Original Articles

HAADF-STEM observations of a Σ13 grain boundary in α-Al2O3 from two orthogonal directions

S. Azuma Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
,
N. Shibata Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan; PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan
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S.D. Findlay Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
,
T. Mizoguchi Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
,
T. Yamamoto Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan; Nanostructures Research Laboratory, Japan Fine Ceramic Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
&
Y. Ikuhara Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan; Nanostructures Research Laboratory, Japan Fine Ceramic Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, JapanCorrespondence[email protected]
Pages 539-546 | Received 20 Nov 2009, Accepted 21 Dec 2009, Published online: 04 May 2010
 
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Abstract

Atomic structure of a Σ = 13, grain boundary in α-Al2O3 was directly observed by aberration-corrected Z-contrast scanning transmission electron microscopy. Combining observations from two orthogonal directions parallel to the grain boundary plane , the three-dimensional atomic configuration of the grain boundary core region can be determined, and proves to be in a good agreement with the stable boundary structure predicted by first-principles calculations.

Acknowledgements

This work was supported in part by the Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic-scale Modification” from the Ministry of Education, Culture, Sports and Technology (MEXT). S.D. Findlay acknowledges support from the Japan Society for the Promotion of Science (JSPS). N. Shibata acknowledges support from PRESTO, Japan Science and Technology Agency and the Grant-in-Aid for young Scientists (A) (20686042) from MEXT.

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