Precipitation of MgO·nAl2O3 in Mg-doped α-Al2O3 under electron irradiation

Kenji Kaneko, Takeharu Kato, Mikio Kitayama, Yoshitsugu Tomokiyo

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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.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalJournal of the American Ceramic Society
Issue number1
Publication statusPublished - Jan 2003

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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