Cation disordering in magnesium aluminate spinel crystals induced by electron or ion irradiation

Takeshi Soeda, Syo Matsumura, Chiken Kinoshita, Nestor J. Zaluzec

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Abstract

Structural changes in magnesium aluminate spinel (MgO · nAl2O3) single crystals, which were irradiated with 900 keV electrons or 1 MeV Ne+ ions at 873 K, were examined by electron channeling enhanced X-ray microanalysis. Unirradiated MgO · Al2O3 has a tendency to form the normal spinel configuration, where Mg2+ ions and Al3+ ions occupy mainly the tetrahedral and the octahedral sites, respectively. Electron irradiation induces simple cation disordering between the tetrahedral sites and the octahedral sites in MgO · Al2O3. In addition to cation disordering, slight evacuation of cations from the tetrahedral sites to the octahedral sites occurs in a peak-damaged area in MgO · Al2O3 irradiated with Ne+ ions. In contrast, cation disordering is suppressed in MgO · 2.4Al2O3 irradiated with electrons. The structural vacancies, present in the non-stoichiometric compound, appear to be effective in promoting irradiation damage recovery through interstitial-vacancy recombination.

Original languageEnglish
Pages (from-to)952-956
Number of pages5
JournalJournal of Nuclear Materials
Volume283-287
Issue numberPART II
DOIs
Publication statusPublished - Jan 1 2000

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Electron irradiation
electron irradiation
Ion bombardment
ion irradiation
spinel
Magnesium
Cations
magnesium
Positive ions
Ions
cations
Crystals
Vacancies
crystals
Electrons
ions
electrons
Microanalysis
microanalysis
interstitials

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Cite this

Cation disordering in magnesium aluminate spinel crystals induced by electron or ion irradiation. / Soeda, Takeshi; Matsumura, Syo; Kinoshita, Chiken; Zaluzec, Nestor J.

In: Journal of Nuclear Materials, Vol. 283-287, No. PART II, 01.01.2000, p. 952-956.

Research output: Contribution to journalArticle

Soeda, Takeshi ; Matsumura, Syo ; Kinoshita, Chiken ; Zaluzec, Nestor J. / Cation disordering in magnesium aluminate spinel crystals induced by electron or ion irradiation. In: Journal of Nuclear Materials. 2000 ; Vol. 283-287, No. PART II. pp. 952-956.
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abstract = "Structural changes in magnesium aluminate spinel (MgO · nAl2O3) single crystals, which were irradiated with 900 keV electrons or 1 MeV Ne+ ions at 873 K, were examined by electron channeling enhanced X-ray microanalysis. Unirradiated MgO · Al2O3 has a tendency to form the normal spinel configuration, where Mg2+ ions and Al3+ ions occupy mainly the tetrahedral and the octahedral sites, respectively. Electron irradiation induces simple cation disordering between the tetrahedral sites and the octahedral sites in MgO · Al2O3. In addition to cation disordering, slight evacuation of cations from the tetrahedral sites to the octahedral sites occurs in a peak-damaged area in MgO · Al2O3 irradiated with Ne+ ions. In contrast, cation disordering is suppressed in MgO · 2.4Al2O3 irradiated with electrons. The structural vacancies, present in the non-stoichiometric compound, appear to be effective in promoting irradiation damage recovery through interstitial-vacancy recombination.",
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N2 - Structural changes in magnesium aluminate spinel (MgO · nAl2O3) single crystals, which were irradiated with 900 keV electrons or 1 MeV Ne+ ions at 873 K, were examined by electron channeling enhanced X-ray microanalysis. Unirradiated MgO · Al2O3 has a tendency to form the normal spinel configuration, where Mg2+ ions and Al3+ ions occupy mainly the tetrahedral and the octahedral sites, respectively. Electron irradiation induces simple cation disordering between the tetrahedral sites and the octahedral sites in MgO · Al2O3. In addition to cation disordering, slight evacuation of cations from the tetrahedral sites to the octahedral sites occurs in a peak-damaged area in MgO · Al2O3 irradiated with Ne+ ions. In contrast, cation disordering is suppressed in MgO · 2.4Al2O3 irradiated with electrons. The structural vacancies, present in the non-stoichiometric compound, appear to be effective in promoting irradiation damage recovery through interstitial-vacancy recombination.

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