A number of nanoscale precipitates with random orientations were produced by electron irradiation of polycrystalline Mg-doped α-Al2O3. The precipitation behavior and microstructural changes were observed using in situ high-resolution transmission electron microscopy. A ring pattern corresponding to a polycrystalline fee structure was obtained from the region of these precipitates by selected-area diffraction, and they were identified as nonstoichiometric MgO·nAl2O3. It is believed that Al2O3 with MgO(ss) and/or MgO at the grain boundaries is effectively stabilized by the electron irradiation process, forming the fundamental structure of MgO·nAl2O3. The average size of the precipitates is about 10 nm.
|ジャーナル||Journal of the American Ceramic Society|
|出版ステータス||出版済み - 1 2003|
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