Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions

T. Yamamoto, M. Shimada, K. Yasuda, S. Matsumura, Y. Chimi, N. Ishikawa

研究成果: ジャーナルへの寄稿会議記事査読

14 被引用数 (Scopus)


We have investigated the microstructure and atomic disordering of nearly stoichiometric magnesium aluminate spinel (MgO • 1.1Al2O 3), irradiated with 200 MeV Xe14+ ions (Se = 25 keV/nm). Transmission electron microscopy techniques of bright-field (BF) and high-resolution (HR) imaging, as well as high angular resolution electron channeling X-ray spectroscopy (HARECXS) were employed for quantitative analysis of radiation-induced structural change. BF images of ion tracks show columnar dark contrast of ∼4 nm in diameter accompanying distinct black or white dots at the incident surface. Clear lattice fringes are observed in HR images even inside the ion tracks, indicating that the spinel crystals are not amorphized but partially disordered along the ion tracks. HARECXS analysis showed that cation disordering progresses successively with ion fluence, and the disordered regions are found to extend over 12.8 ± 0.9 nm in diameter for Al ions and 9.6 ± 0.6 nm for Mg ions along the ion tracks. This chemically disordered region is much larger than the strained volume detected by BF and HR images.

ジャーナルNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
出版ステータス出版済み - 4月 2006
イベントProceedings of the Sixth International Symposium on Swift Heavy Ions in Matter (SHIM 2005) -
継続期間: 5月 28 20055月 31 2005

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 器械工学


「Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。