Local structure investigations of accumulated damage in irradiated MgAl2O4

Damaged structures in the MgAl2O4 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...

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Published inJournal of the American Ceramic Society Vol. 103; no. 8; pp. 4654 - 4663
Main Authors Yoshioka, Satoru, Tsuruta, Konosuke, Yamamoto, Tomokazu, Yasuda, Kazuhiro, Matsumura, Syo, Sugiyama, Takeharau, Oba, Yojiro, Ishikawa, Norito, Kobayashi, Eiichi, Okudaira, Koji
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.08.2020
Subjects
Aluminum
cationic disorder
Cations
Damage accumulation
first principles calculations
Fluence
Heavy ions
Magnesium
Phosphates
Radiation damage
Small angle X ray scattering
Spectra
spinel
Structural damage
x-ray absorption near edge structure
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Summary:Damaged structures in the MgAl2O4 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17101