TY - JOUR
T1 - Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions
AU - Yamamoto, T.
AU - Shimada, M.
AU - Yasuda, K.
AU - Matsumura, S.
AU - Chimi, Y.
AU - Ishikawa, N.
N1 - Funding Information:
Ion irradiation experiments were performed at the Tandem ion accelerator facility in JAERI – Tokai, and the electron microscopy observations/analyses were done at the HVEM Laboratory of Kyushu University. We thank the staff of both facilities for their technical assistance. This work was supported in part by the Grant-in-Aid for Scientific Research (B) under contract of #15360336 and #17360313, and for the Junior Scientist from the Japan Society of Promotion of Science (JSPS).
PY - 2006/4
Y1 - 2006/4
N2 - 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.
AB - 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.
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U2 - 10.1016/j.nimb.2005.11.108
DO - 10.1016/j.nimb.2005.11.108
M3 - Conference article
AN - SCOPUS:33644505825
SN - 0168-583X
VL - 245
SP - 235
EP - 238
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1
T2 - Proceedings of the Sixth International Symposium on Swift Heavy Ions in Matter (SHIM 2005)
Y2 - 28 May 2005 through 31 May 2005
ER -