Local structure investigations of accumulated damage in irradiated MgAl2O4

Satoru Yoshioka; Konosuke Tsuruta; Tomokazu Yamamoto; Kazuhiro Yasuda; Syo Matsumura; Takeharau Sugiyama; Yojiro Oba; Norito Ishikawa; Eiichi Kobayashi; Koji Okudaira

doi:10.1111/jace.17101

Local structure investigations of accumulated damage in irradiated MgAl₂O₄

Satoru Yoshioka, Konosuke Tsuruta, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura, Takeharau Sugiyama, Yojiro Oba, Norito Ishikawa, Eiichi Kobayashi, Koji Okudaira

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7 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	4654-4663
Number of pages	10
Journal	Journal of the American Ceramic Society
Volume	103
Issue number	8
DOIs	https://doi.org/10.1111/jace.17101
Publication status	Published - Aug 1 2020

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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10.1111/jace.17101

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title = "Local structure investigations of accumulated damage in irradiated MgAl2O4",

abstract = "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.",

author = "Satoru Yoshioka and Konosuke Tsuruta and Tomokazu Yamamoto and Kazuhiro Yasuda and Syo Matsumura and Takeharau Sugiyama and Yojiro Oba and Norito Ishikawa and Eiichi Kobayashi and Koji Okudaira",

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T1 - Local structure investigations of accumulated damage in irradiated MgAl2O4

AU - Yoshioka, Satoru

AU - Tsuruta, Konosuke

AU - Yamamoto, Tomokazu

AU - Yasuda, Kazuhiro

AU - Matsumura, Syo

AU - Sugiyama, Takeharau

AU - Oba, Yojiro

AU - Ishikawa, Norito

AU - Kobayashi, Eiichi

AU - Okudaira, Koji

PY - 2020/8/1

Y1 - 2020/8/1

N2 - 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.

AB - 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.

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Local structure investigations of accumulated damage in irradiated MgAl₂O₄

Abstract

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