Production and stability of radiation-induced defects in MgAl2O4 under electronic excitation

Kazuhiro Yasuda, T. Yamamoto, S. Seki, K. Shiiyama, Syo Matsumura

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5 Citations (Scopus)

Abstract

This paper investigates the formation process of radiation-induced defects in magnesium aluminate spinel and their stability using transmission electron microscopy, with emphasis on the effects of electronic excitation. Small interstitial-type dislocation loops disappeared under electron-induced electronic excitation. The elimination rate of the loops was found to be one order higher than for α-alumina. The disappearance of dislocation loops by a dissociation mechanism into isolated interstitials is discussed through analysis of the growth-and-shrink process of the loops. HARECXS analysis on cross section specimens irradiated with 350 MeV Au ions has shown the progress of cation disordering along ion tracks to be a function of electronic stopping power, (dE/dx)e. Cations were found to exchange their sites toward a random configuration. Such disordering appears from (dE/dx)e = 10 keV/nm, and increases in size with increasing (dE/dx)e to reach nearly 10 nm in diameter at 30 keV/nm, under an assumption of a fully disordered configuration.

Original languageEnglish
Pages (from-to)2834-2841
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume266
Issue number12-13
DOIs
Publication statusPublished - Jun 1 2008

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Positive ions
Radiation
Defects
defects
Ions
radiation
Power electronics
electronics
excitation
Magnesium
Ion exchange
interstitials
Alumina
Transmission electron microscopy
cations
Electrons
stopping power
configurations
spinel
magnesium

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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title = "Production and stability of radiation-induced defects in MgAl2O4 under electronic excitation",
abstract = "This paper investigates the formation process of radiation-induced defects in magnesium aluminate spinel and their stability using transmission electron microscopy, with emphasis on the effects of electronic excitation. Small interstitial-type dislocation loops disappeared under electron-induced electronic excitation. The elimination rate of the loops was found to be one order higher than for α-alumina. The disappearance of dislocation loops by a dissociation mechanism into isolated interstitials is discussed through analysis of the growth-and-shrink process of the loops. HARECXS analysis on cross section specimens irradiated with 350 MeV Au ions has shown the progress of cation disordering along ion tracks to be a function of electronic stopping power, (dE/dx)e. Cations were found to exchange their sites toward a random configuration. Such disordering appears from (dE/dx)e = 10 keV/nm, and increases in size with increasing (dE/dx)e to reach nearly 10 nm in diameter at 30 keV/nm, under an assumption of a fully disordered configuration.",
author = "Kazuhiro Yasuda and T. Yamamoto and S. Seki and K. Shiiyama and Syo Matsumura",
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TY - JOUR

T1 - Production and stability of radiation-induced defects in MgAl2O4 under electronic excitation

AU - Yasuda, Kazuhiro

AU - Yamamoto, T.

AU - Seki, S.

AU - Shiiyama, K.

AU - Matsumura, Syo

PY - 2008/6/1

Y1 - 2008/6/1

N2 - This paper investigates the formation process of radiation-induced defects in magnesium aluminate spinel and their stability using transmission electron microscopy, with emphasis on the effects of electronic excitation. Small interstitial-type dislocation loops disappeared under electron-induced electronic excitation. The elimination rate of the loops was found to be one order higher than for α-alumina. The disappearance of dislocation loops by a dissociation mechanism into isolated interstitials is discussed through analysis of the growth-and-shrink process of the loops. HARECXS analysis on cross section specimens irradiated with 350 MeV Au ions has shown the progress of cation disordering along ion tracks to be a function of electronic stopping power, (dE/dx)e. Cations were found to exchange their sites toward a random configuration. Such disordering appears from (dE/dx)e = 10 keV/nm, and increases in size with increasing (dE/dx)e to reach nearly 10 nm in diameter at 30 keV/nm, under an assumption of a fully disordered configuration.

AB - This paper investigates the formation process of radiation-induced defects in magnesium aluminate spinel and their stability using transmission electron microscopy, with emphasis on the effects of electronic excitation. Small interstitial-type dislocation loops disappeared under electron-induced electronic excitation. The elimination rate of the loops was found to be one order higher than for α-alumina. The disappearance of dislocation loops by a dissociation mechanism into isolated interstitials is discussed through analysis of the growth-and-shrink process of the loops. HARECXS analysis on cross section specimens irradiated with 350 MeV Au ions has shown the progress of cation disordering along ion tracks to be a function of electronic stopping power, (dE/dx)e. Cations were found to exchange their sites toward a random configuration. Such disordering appears from (dE/dx)e = 10 keV/nm, and increases in size with increasing (dE/dx)e to reach nearly 10 nm in diameter at 30 keV/nm, under an assumption of a fully disordered configuration.

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JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

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