Quantitative electron diffraction study of cation configuration and irradiation induced displacement in magnesium aluminate spinel crystals

Takeshi Soeda, Syo Matsumura, Jiro Hayata, Chiken Kinoshita

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The electron channeling enhanced X-ray microanalysis and the large angle convergent beam electron diffraction were simultaneously employed to determine cation configuration in magnesium aluminate spinel (MgO·nAl2O3) crystals as a function of composition n and irradiation dose with 1 MeV electrons or 300 keV O+ ions. In as-grown single crystals, about 70% of Mg2+ ions and about 20% of Al3+ ions reside on the tetrahedral sites, while the remaining ions are located on the octahedral sites. The occupation probabilities of ions are almost independent of the value n. Most of structural vacancies are located on the tetrahedral sites in non-stoichiometric compounds with n > 1. The cation distribution is hardly changed under irradiation with 1 MeV electrons to 1.9 dpa at 870 K. In contrast, significant displacements of Al3+ ions are induced under irradiation with 300 keV O+ ions to 1.4 dpa at 870 K. The anti-site Al3+ ions on the tetrahedral sites almost vanish under the latter condition of irradiation.

Original languageEnglish
Pages (from-to)531-536
Number of pages6
JournalJournal of Electron Microscopy
Volume48
Issue number5
DOIs
Publication statusPublished - Jan 1 1999

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Electron diffraction
spinel
Magnesium
Cations
magnesium
electron diffraction
Positive ions
Irradiation
Electrons
Ions
cations
Crystals
irradiation
configurations
crystals
ions
Electron Probe Microanalysis
electrons
aluminum magnesium oxide
spinell

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Quantitative electron diffraction study of cation configuration and irradiation induced displacement in magnesium aluminate spinel crystals. / Soeda, Takeshi; Matsumura, Syo; Hayata, Jiro; Kinoshita, Chiken.

In: Journal of Electron Microscopy, Vol. 48, No. 5, 01.01.1999, p. 531-536.

Research output: Contribution to journalArticle

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N2 - The electron channeling enhanced X-ray microanalysis and the large angle convergent beam electron diffraction were simultaneously employed to determine cation configuration in magnesium aluminate spinel (MgO·nAl2O3) crystals as a function of composition n and irradiation dose with 1 MeV electrons or 300 keV O+ ions. In as-grown single crystals, about 70% of Mg2+ ions and about 20% of Al3+ ions reside on the tetrahedral sites, while the remaining ions are located on the octahedral sites. The occupation probabilities of ions are almost independent of the value n. Most of structural vacancies are located on the tetrahedral sites in non-stoichiometric compounds with n > 1. The cation distribution is hardly changed under irradiation with 1 MeV electrons to 1.9 dpa at 870 K. In contrast, significant displacements of Al3+ ions are induced under irradiation with 300 keV O+ ions to 1.4 dpa at 870 K. The anti-site Al3+ ions on the tetrahedral sites almost vanish under the latter condition of irradiation.

AB - The electron channeling enhanced X-ray microanalysis and the large angle convergent beam electron diffraction were simultaneously employed to determine cation configuration in magnesium aluminate spinel (MgO·nAl2O3) crystals as a function of composition n and irradiation dose with 1 MeV electrons or 300 keV O+ ions. In as-grown single crystals, about 70% of Mg2+ ions and about 20% of Al3+ ions reside on the tetrahedral sites, while the remaining ions are located on the octahedral sites. The occupation probabilities of ions are almost independent of the value n. Most of structural vacancies are located on the tetrahedral sites in non-stoichiometric compounds with n > 1. The cation distribution is hardly changed under irradiation with 1 MeV electrons to 1.9 dpa at 870 K. In contrast, significant displacements of Al3+ ions are induced under irradiation with 300 keV O+ ions to 1.4 dpa at 870 K. The anti-site Al3+ ions on the tetrahedral sites almost vanish under the latter condition of irradiation.

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