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

Kenji Kaneko, Takeharu Kato, Mikio Kitayama, Yoshitsugu Tomokiyo

Research output: Contribution to journalArticle

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Abstract

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
Volume86
Issue number1
DOIs
Publication statusPublished - Jan 2003

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Electron irradiation
Precipitates
High resolution transmission electron microscopy
Grain boundaries
Diffraction

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Precipitation of MgO·nAl2O3 in Mg-doped α-Al2O3 under electron irradiation. / Kaneko, Kenji; Kato, Takeharu; Kitayama, Mikio; Tomokiyo, Yoshitsugu.

In: Journal of the American Ceramic Society, Vol. 86, No. 1, 01.2003, p. 161-168.

Research output: Contribution to journalArticle

Kaneko, Kenji ; Kato, Takeharu ; Kitayama, Mikio ; Tomokiyo, Yoshitsugu. / Precipitation of MgO·nAl2O3 in Mg-doped α-Al2O3 under electron irradiation. In: Journal of the American Ceramic Society. 2003 ; Vol. 86, No. 1. pp. 161-168.
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