Abstract
Accumulation and recovery of radiation-induced damage with swift heavy ions in stoichiometric magnesium aluminate spinel, MgAl2O4, has been investigated. Microstructural change and atomic disordering was examined through transmission electron microscopy (TEM) techniques, with bright-field (BF) and high-resolution (HR) TEM images, and high angular resolution electron channelling X-ray spectroscopy (HARECXS), for single crystal MgAl2O4 irradiated with 200 MeV Xe, and 340 or 350 MeV Au ions. The density of core damage region, detected by BFTEM with Fresnel-contrast, increased proportionally with ion fluence at the early stage of accumulation and saturated at a fluence higher than 1016 ions m-2. This result is discussed with a balance between the formation and recovery of the core damage region under irradiation, and the influence region to induce the recovery was evaluated to be 7-9 nm in radius. HARECXS and electron diffraction analysis revealed that cations at tetrahedral sites preferentially occupy octahedral sites to transform to defective rock-salt structure. The structure of the core damage region is found from HR and BFTEM images to be a columnar vacancy-rich region with a low atomic density.
| Original language | English |
|---|---|
| Pages (from-to) | 1082-1088 |
| Number of pages | 7 |
| Journal | International Journal of Materials Research |
| Volume | 102 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Oct 5 2011 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry
Cite this
Accumulation of radiation damage and disordering in MgAl2O 4 under swift heavy ion irradiation. / Yasuda, Kazuhiro; Yamamotoa, Tomokazu; Etoh, Motoki; Kawasoea, Shinji; Matsumura, Syo; Ishikawa, Norito.
In: International Journal of Materials Research, Vol. 102, No. 9, 05.10.2011, p. 1082-1088.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Accumulation of radiation damage and disordering in MgAl2O 4 under swift heavy ion irradiation
AU - Yasuda, Kazuhiro
AU - Yamamotoa, Tomokazu
AU - Etoh, Motoki
AU - Kawasoea, Shinji
AU - Matsumura, Syo
AU - Ishikawa, Norito
PY - 2011/10/5
Y1 - 2011/10/5
N2 - Accumulation and recovery of radiation-induced damage with swift heavy ions in stoichiometric magnesium aluminate spinel, MgAl2O4, has been investigated. Microstructural change and atomic disordering was examined through transmission electron microscopy (TEM) techniques, with bright-field (BF) and high-resolution (HR) TEM images, and high angular resolution electron channelling X-ray spectroscopy (HARECXS), for single crystal MgAl2O4 irradiated with 200 MeV Xe, and 340 or 350 MeV Au ions. The density of core damage region, detected by BFTEM with Fresnel-contrast, increased proportionally with ion fluence at the early stage of accumulation and saturated at a fluence higher than 1016 ions m-2. This result is discussed with a balance between the formation and recovery of the core damage region under irradiation, and the influence region to induce the recovery was evaluated to be 7-9 nm in radius. HARECXS and electron diffraction analysis revealed that cations at tetrahedral sites preferentially occupy octahedral sites to transform to defective rock-salt structure. The structure of the core damage region is found from HR and BFTEM images to be a columnar vacancy-rich region with a low atomic density.
AB - Accumulation and recovery of radiation-induced damage with swift heavy ions in stoichiometric magnesium aluminate spinel, MgAl2O4, has been investigated. Microstructural change and atomic disordering was examined through transmission electron microscopy (TEM) techniques, with bright-field (BF) and high-resolution (HR) TEM images, and high angular resolution electron channelling X-ray spectroscopy (HARECXS), for single crystal MgAl2O4 irradiated with 200 MeV Xe, and 340 or 350 MeV Au ions. The density of core damage region, detected by BFTEM with Fresnel-contrast, increased proportionally with ion fluence at the early stage of accumulation and saturated at a fluence higher than 1016 ions m-2. This result is discussed with a balance between the formation and recovery of the core damage region under irradiation, and the influence region to induce the recovery was evaluated to be 7-9 nm in radius. HARECXS and electron diffraction analysis revealed that cations at tetrahedral sites preferentially occupy octahedral sites to transform to defective rock-salt structure. The structure of the core damage region is found from HR and BFTEM images to be a columnar vacancy-rich region with a low atomic density.
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U2 - 10.3139/146.110564
DO - 10.3139/146.110564
M3 - Article
VL - 102
SP - 1082
EP - 1088
JO - International Journal of Materials Research
JF - International Journal of Materials Research
SN - 1862-5282
IS - 9
ER -