Zr segregation and associated Al vacancies in alumina grain boundaries

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Author(s)

Abstract

Segregated dopants at grain boundary dramatically change the material’s mechanical and electrical properties. The knowledge of the behavior of these dopants are therefore key for further material developments. Here, a Zr doped alumina (Al<sub>2</sub>O<sub>3</sub>) bicrystal was fabricated and the atomic structure of the grain boundary was characterized using scanning transmission electron microscopy (STEM). Zr was found to segregate to specific sites along the grain boundary, which was neighbored by Al columns of weak image intensity. First principles calculations and static lattice calculations revealed that the charge compensating Al vacancies are most stable in Al columns neighboring the location of the Zr sites. Multi-slice simulations of STEM images confirmed that Al columns containing vacancies exhibit a reduction in image intensity. These results indicate that associated Al vacancies strongly influence its atomic site segregation behavior of Zr.

Journal

  • Journal of the Ceramic Society of Japan

    Journal of the Ceramic Society of Japan 119(1395), 840-844, 2011

    The Ceramic Society of Japan

Codes

  • NII Article ID (NAID)
    130001310511
  • NII NACSIS-CAT ID (NCID)
    AA12229489
  • Text Lang
    ENG
  • Article Type
    特集
  • ISSN
    1882-0743
  • NDL Article ID
    11291121
  • NDL Source Classification
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL Call No.
    Z78-A504
  • Data Source
    NDL  J-STAGE 
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