TY - JOUR
T1 - Mass transfer through a single grain boundary in alumina bicrystals under oxygen potential gradients
AU - Matsudaira, Tsuneaki
AU - Kitaoka, Satoshi
AU - Shibata, Naoya
AU - Nakagawa, Tsubasa
AU - Ikuhara, Yuichi
N1 - Funding Information:
Acknowledgement The authors are indebted to Mr. Y. Katsuyama, Keyence Co., Japan, for AFM surface profile measurements. This study was partially supported by the Grant-in-Aid for Scientific Research on Priority Areas ‘‘Nano Materials Science for Atomic Scale Modification 474’’ from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan.
PY - 2011/6
Y1 - 2011/6
N2 - The mass-transfer behavior through grain boundaries (GBs) in alumina was systematically investigated using four types of alumina bicrystals. The alumina bicrystal wafers were exposed to the constant oxygen potential gradient(ΔPO2)generated by the combination of two different oxygen partial pressures PO2 (II)and PO2 (I) of 105 and 1 Pa, respectively, at 1923 K. Ridges were formed along the GBs on the surface subjected to PO2 (II), and deep GB ditches were developed on the PO2 (I) surface mainly during the migration of aluminum thorough GBs from the PO2 (I) surface to PO2 (II) surface. The surface morphology changes in the vicinity of the GBs were observed by atomic force microscopy. It was found that the surface morphology changes indicative of the aluminum GB diffusion were strongly dependent on the GB characteristics. The GB diffusion coefficients of aluminum estimated from the volume of the GB ridges showed a clear correlation to the local bonding environments of GB cores estimated from theoretical calculations reported previously.
AB - The mass-transfer behavior through grain boundaries (GBs) in alumina was systematically investigated using four types of alumina bicrystals. The alumina bicrystal wafers were exposed to the constant oxygen potential gradient(ΔPO2)generated by the combination of two different oxygen partial pressures PO2 (II)and PO2 (I) of 105 and 1 Pa, respectively, at 1923 K. Ridges were formed along the GBs on the surface subjected to PO2 (II), and deep GB ditches were developed on the PO2 (I) surface mainly during the migration of aluminum thorough GBs from the PO2 (I) surface to PO2 (II) surface. The surface morphology changes in the vicinity of the GBs were observed by atomic force microscopy. It was found that the surface morphology changes indicative of the aluminum GB diffusion were strongly dependent on the GB characteristics. The GB diffusion coefficients of aluminum estimated from the volume of the GB ridges showed a clear correlation to the local bonding environments of GB cores estimated from theoretical calculations reported previously.
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U2 - 10.1007/s10853-010-5017-z
DO - 10.1007/s10853-010-5017-z
M3 - Article
AN - SCOPUS:79953801183
VL - 46
SP - 4407
EP - 4412
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 12
ER -