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  • Ishikawa, Norito  (3)
  • Matsumura, Syo  (3)
  • Yasuda, Kazuhiro  (3)
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  • 1
    Online Resource
    Online Resource
    Local structure investigations of accumulated damage in irradiated MgAl 2 O 4
    Wiley ; 2020
    In:  Journal of the American Ceramic Society Vol. 103, No. 8 ( 2020-08), p. 4654-4663
    Details
    In: Journal of the American Ceramic Society, Wiley, Vol. 103, No. 8 ( 2020-08), p. 4654-4663
    Abstract: Damaged structures in the MgAl 2 O 4 spinel induced by swift heavy ions were investigated using the X‐ray absorption near edge structure (XANES) and small angle X‐ray scattering (SAXS). Increasing the fluence of 100 MeV Xe ions leads to increased SAXS intensity and XANES spectral changes on both Mg and Al K ‐edges. The damaged regions of ion tracks were observed by SAXS to be cylindrical in shape with a diameter of 5 nm. The theoretical XANES spectra indicated that the changes in the experimental spectra were due to the cationic disordering between tetrahedral and octahedral sites. This disordering caused an increase in the inversion degree of the cations. Furthermore, the quantitative analysis of the XANES spectra revealed the preferential occupation of cations at the octahedral sites at high fluence.
    Type of Medium: Online Resource
    ISSN: 0002-7820 , 1551-2916
    URL: Issue
    URL: Article
    DOI: 10.1111/jace.v103.8
    DOI: 10.1111/jace.17101
    RVK:
    VA 1120
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2008170-4
    detail.hit.zdb_id: 219232-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Microstructure evolution in 200-MeV Xe ion irradiated CeO2 doped with Gd2O3
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 132, No. 23 ( 2022-12-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 132, No. 23 ( 2022-12-21)
    Abstract: The microstructure of virgin and heavy ion-irradiated Ce1–xGdxO2–x/2 with a wide range of Gd dopant concentrations (0 ≤ xGd ≤ 0.5) was evaluated by x-ray diffraction (XRD), micro-Raman spectroscopy, and transmission electron microscopy (TEM) for selected area electron diffraction (SAED) analysis and plane-view bright-field (BF) imaging of ion tracks. The Ce1–xGdxO2–x/2 samples were irradiated with 200-MeV Xe14+ ions up to fluences from 3 × 1011 to 1 × 1013 cm−2 at ambient temperature. XRD patterns of the virgin Ce1–xGdxO2–x/2 samples showed saturation of lattice parameter and relaxation of microstrain in Ce1–xGdxO2–x/2 which are attributed to the increasing Gd concentration. Moreover, micro-Raman spectroscopy and SAED patterns revealed the bixbyite (C-type) structure formation and oxygen vacancy ordering for xGd  & gt; 0.2 that is induced by dispersed C-type domains in the fluorite-structured (F-type) matrix. In the irradiated samples, asymmetric XRD peaks induced by lattice distortion were observed together with ion tracks in BF-TEM images. The radiation damage was recovered with the increase of Gd concentration. There is a rapid reduction of radiation damage cross section for xGd  & gt; 0.2 with a reduction of the C-type structure reflections in XRD and SAED patterns.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0121951
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Accumulation of radiation damage and disordering in MgAl 2 O 4 under swift heavy ion irradiation : Dedicated to Prof. Dr.-Ing. Heinrich Wollenberger on the occasion of his 80 th birthday
    Walter de Gruyter GmbH ; 2011
    In:  International Journal of Materials Research Vol. 102, No. 9 ( 2011-09-01), p. 1082-1088
    Details
    In: International Journal of Materials Research, Walter de Gruyter GmbH, Vol. 102, No. 9 ( 2011-09-01), p. 1082-1088
    Abstract: Accumulation and recovery of radiation-induced damage with swift heavy ions in stoichiometric magnesium aluminate spinel, MgAl 2 O 4 , 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 MgAl 2 O 4 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 10 16 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.
    Type of Medium: Online Resource
    ISSN: 2195-8556 , 1862-5282
    URL: Article
    DOI: 10.3139/146.110564
    RVK:
    ZG 1100
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2011
    detail.hit.zdb_id: 2232675-3
    detail.hit.zdb_id: 2128058-7
    detail.hit.zdb_id: 203021-4
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