Abstract
An alumina (α-Al2O3) bicrystal with a (\( \bar{1} \)104)/[11\( \bar{2} \)0] 2o low-angle tilt grain boundary was fabricated by diffusion bonding at 1500 °C in air, and the grain boundary was observed by transmission electron microscopy (TEM). High-resolution TEM observations revealed that the grain boundary consists of at least two kinds of dislocations. One is a perfect dislocation which has a Burgers vector of 1/3[\( \bar{1} \)2\( \bar{1} \)0]. The other is dissociated into two partial dislocations with a stacking fault on the (0001) plane, and each partial dislocation has a 1/6[\( \bar{1} \)101] edge component. It is suggested from structural considerations that the dissociated-dislocation pair originates from a b = 1/3[02\( \bar{2} \)1] perfect dislocation (i.e., 1/3[02\( \bar{2} \)1] → 1/6[02\( \bar{2} \)1] + 1/6[02\( \bar{2} \)1]). This dissociation produces a stacking fault in the anion sublattice. The stacking fault energy is estimated to be roughly 1.3 Jm−2 based on the elastic theory. The authors discuss the dislocation structures and the stacking fault formed on the (0001) plane in detail.
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Acknowledgements
The authors would like to thank S.D. Findlay for critically reading the manuscript. This study was supported in part by the Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic-scale Modification” (no. 19053001) from the Ministry of Education, Culture, Sports and Technology (MEXT). E.T. was supported as a Japan Society for the Promotion of Science (JSPS) research fellow. N.S. acknowledges supports from PRESTO, Japan Science and Technology Agency, and the Grant-in-Aid for Young Scientists (A) (20686042) from MEXT.
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Tochigi, E., Shibata, N., Nakamura, A. et al. Dislocation structures in a {\( \bar{1} \)104}/〈11\( \bar{2} \)0〉 low-angle tilt grain boundary of alumina (α-Al2O3). J Mater Sci 46, 4428–4433 (2011). https://doi.org/10.1007/s10853-011-5430-y
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DOI: https://doi.org/10.1007/s10853-011-5430-y