TY - JOUR
T1 - Atomic structure of ion tracks in Ceria
AU - Takaki, S.
AU - Yasuda, K.
AU - Yamamoto, T.
AU - Matsumura, S.
AU - Ishikawa, N.
N1 - Funding Information:
The authors are deeply grateful to the technical staff at the Tandem ion accelerator facility of the Japan Atomic Energy Agency-Tokai and at the HVEM Laboratory of Kyushu University for their skillful assistance during swift heavy ion irradiation and microscopy observations, respectively. We also express our gratitude to Professor Yoshitsugu Tomokiyo of Kyushu University for a fruitful discussion. This work was partly supported by a Grant-in-Aid for Scientific Research (C) ( #25420692 ).
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/5/1
Y1 - 2014/5/1
N2 - We have investigated atomic structure of ion tracks in CeO2 irradiated with 200 MeV Xe ions by transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM observations under inclined conditions showed continuous ion tracks with diffraction and structure factor contrast, and the decrease in the atomic density of the ion tracks was evaluated to be about 10%. High resolution STEM with high-angle annular dark-field (HAADF) technique showed that the crystal structure of the Ce cation column is retained at the core region of ion tracks, although the signal intensity of the Ce cation lattice is reduced over a region 4-5 nm in size. Annular bright field (ABF) STEM observation has detected that the O anion column is preferentially distorted at the core region of ion tracks within a diameter of 4 nm. The core region of ion track in CeO2 is determined to contain a high concentration of vacancies or small vacancy clusters and to generate interstitials in surrounding regions.
AB - We have investigated atomic structure of ion tracks in CeO2 irradiated with 200 MeV Xe ions by transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM observations under inclined conditions showed continuous ion tracks with diffraction and structure factor contrast, and the decrease in the atomic density of the ion tracks was evaluated to be about 10%. High resolution STEM with high-angle annular dark-field (HAADF) technique showed that the crystal structure of the Ce cation column is retained at the core region of ion tracks, although the signal intensity of the Ce cation lattice is reduced over a region 4-5 nm in size. Annular bright field (ABF) STEM observation has detected that the O anion column is preferentially distorted at the core region of ion tracks within a diameter of 4 nm. The core region of ion track in CeO2 is determined to contain a high concentration of vacancies or small vacancy clusters and to generate interstitials in surrounding regions.
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U2 - 10.1016/j.nimb.2013.10.077
DO - 10.1016/j.nimb.2013.10.077
M3 - Article
AN - SCOPUS:84899443531
SN - 0168-583X
VL - 326
SP - 140
EP - 144
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
ER -