TY - JOUR
T1 - Atomic structures and energies of Σ7 symmetrical tilt grain boundaries in alumina bicrystals
AU - Nishimura, Hitoshi
AU - Matsunaga, Katsuyuki
AU - Saito, Tomohiro
AU - Yamamoto, Takahisa
AU - Ikuhara, Yuichi
PY - 2003/4
Y1 - 2003/4
N2 - Symmetrical Σ7 tilt grain boundaries of alumina (Al2O3) were studied using bicrystals. Three types of Σ7 boundaries were successfully fabricated, that is, rhombohedral twin (Σ7{11̄02}) and two types of [0001] symmetrical tilt grain boundaries with grain-boundary planes {45̄10} and {23̄10} (Σ7(45̄10} and Σ7(23̄10}). Their atomic structures and grain-boundary energies were investigated using high-resolution transmission electron microscopy (HRTEM) and a thermal grooving technique, respectively. HRTEM observations showed that the Σ7(11̄02} boundary had a completely symmetrical atomic arrangement with respect to the grain-boundary plane. In contrast, Σ7(23̄10} and Σ7(45̄10} boundaries exhibited asymmetrical atomic structures, which were confirmed by analyzing the atomic configurations using static lattice calculations. Thermal grooving experiments showed that the grain-boundary energies strongly depended on the properties of the grain-boundary planes.
AB - Symmetrical Σ7 tilt grain boundaries of alumina (Al2O3) were studied using bicrystals. Three types of Σ7 boundaries were successfully fabricated, that is, rhombohedral twin (Σ7{11̄02}) and two types of [0001] symmetrical tilt grain boundaries with grain-boundary planes {45̄10} and {23̄10} (Σ7(45̄10} and Σ7(23̄10}). Their atomic structures and grain-boundary energies were investigated using high-resolution transmission electron microscopy (HRTEM) and a thermal grooving technique, respectively. HRTEM observations showed that the Σ7(11̄02} boundary had a completely symmetrical atomic arrangement with respect to the grain-boundary plane. In contrast, Σ7(23̄10} and Σ7(45̄10} boundaries exhibited asymmetrical atomic structures, which were confirmed by analyzing the atomic configurations using static lattice calculations. Thermal grooving experiments showed that the grain-boundary energies strongly depended on the properties of the grain-boundary planes.
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U2 - 10.1111/j.1151-2916.2003.tb03343.x
DO - 10.1111/j.1151-2916.2003.tb03343.x
M3 - Article
AN - SCOPUS:0037389170
VL - 86
SP - 574
EP - 580
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 4
ER -