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

作者：Nakagawa Tsubasa; Nishimura Hitoshi; Sakaguchi Isao; Shibata Naoya; Matsunaga Katsuyuki; Yamamoto Takahisa; Ikuhara Yuichi^*

来源：Scripta Materialia, 2011, 65(6): 544-547.

DOI：10.1016/j.scriptamat.2011.06.024

• Grain boundary diffusion
• Alumina
• Bicrystal
• HREM
• SIMS

We measured oxygen diffusion coefficients (D-gb) along five grain boundaries (GBs) in alumina bicrystals by tracing O-18 by secondary ion mass spectrometry. Although all boundaries are classified as coincident site lattice boundaries with relatively ordered structures, D-gb varied up to 10(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 Sigma values. These results suggest that D-gb are related to GB atomic structures and hence the GB character, especially GB planes.

• 出版日期2011-9