Atomic structure and disordering induced by 350 MeV Au ions in MgAl2O4

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

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25 Citations (Scopus)


Microstructure change and atomic disordering in MgO · nAl2O3 (n = 1.1) irradiated with 350 MeV Au ions (Se = 35 keV/nm) were investigated through transmission electron microscopy (TEM) and high angular resolution electron channeling X-ray spectroscopy (HARECXS) techniques. High resolution TEM revealed that each ion track maintains crystalline structure. The core region of ion track is found to reveal a lattice fringe with a half period of spinel matrix, suggesting the phase transformation from spinel to rock-salt structure. HARECXS analysis clearly showed progress of cation disorder at a significantly large region of ∼10 nm in diameter. These results are compared with the previous results of 200 MeV Xe ion irradiated spinel (Se = 25 keV/nm). The structure of ion tracks is found to consist of three concentric circle structures: the defective core region (∼2 nm in diameter), strained region (∼5 nm) and cation disordered region (10-12 nm).

Original languageEnglish
Pages (from-to)238-244
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1-2 SPEC. ISS.
Publication statusPublished - Sept 2006

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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