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Title: Color-Center Production and Formation in Electron-Irradiated Magnesium Aluminate Spinel and Ceria

Abstract

Single crystals of magnesium aluminate spinel (MgAl2O4) with (100) or (110) orientations and cerium dioxide or ceria (CeO2) were irradiated by 1.0-MeV and 2.5-MeV electrons in a high fluence range. Point-defect production was studied by off-line UV-visible optical spectroscopy after irradiation. For spinel, regardless of both crystal orientation and electron energy, two characteristic broad bands centered at photon energies of 5.4 eV and 4.9 eV were assigned to F and F+ centers (neutral and singly-ionized oxygen vacancies), respectively, on the basis of available literature data. No clear differences in colour-centre formation were observed for the two crystal orientations. Using calculations of displacement cross sections by elastic collisions, these results are consistent with a very large threshold displacement energy (200 eV) for oxygen atoms at RT. A third very broad band centered at 3.7 eV might be attributed either to an oxygen hole center (V-type center) or an F2 dimer center (oxygen di-vacancy). The onset of recovery of these color centers took place at 200°C with almost full bleaching at 600°C. Activation energies (~0.3-0.4 eV) for defect recovery were deduced from the isochronal annealing data by using a first-order kinetics analysis. For ceria, a sub band-gap absorption feature peaked at ~3.1more » eV was recorded for 2.5-MeV electron irradiation only. Assuming a ballistic process, we suggest that the latter defect might result from cerium atom displacement on the basis of computed cross sections.« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [4]
  1. French Atomic Energy Commission (CEA), Gif sur Yvette (France)
  2. Sorbonne Univ. (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Kyushu Univ. (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1261387
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 32; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Spinel; Ceria; Electron-Irradiation; Color Centers

Citation Formats

Costantini, Jean-Marc, Lelong, Gerald, Guillaumet, Maxime, Weber, William J., Takaki, Seiya, and Yasuda, Kazuhiro. Color-Center Production and Formation in Electron-Irradiated Magnesium Aluminate Spinel and Ceria. United States: N. p., 2016. Web. https://doi.org/10.1088/0953-8984/28/32/325901.
Costantini, Jean-Marc, Lelong, Gerald, Guillaumet, Maxime, Weber, William J., Takaki, Seiya, & Yasuda, Kazuhiro. Color-Center Production and Formation in Electron-Irradiated Magnesium Aluminate Spinel and Ceria. United States. https://doi.org/10.1088/0953-8984/28/32/325901
Costantini, Jean-Marc, Lelong, Gerald, Guillaumet, Maxime, Weber, William J., Takaki, Seiya, and Yasuda, Kazuhiro. Mon . "Color-Center Production and Formation in Electron-Irradiated Magnesium Aluminate Spinel and Ceria". United States. https://doi.org/10.1088/0953-8984/28/32/325901. https://www.osti.gov/servlets/purl/1261387.
@article{osti_1261387,
title = {Color-Center Production and Formation in Electron-Irradiated Magnesium Aluminate Spinel and Ceria},
author = {Costantini, Jean-Marc and Lelong, Gerald and Guillaumet, Maxime and Weber, William J. and Takaki, Seiya and Yasuda, Kazuhiro},
abstractNote = {Single crystals of magnesium aluminate spinel (MgAl2O4) with (100) or (110) orientations and cerium dioxide or ceria (CeO2) were irradiated by 1.0-MeV and 2.5-MeV electrons in a high fluence range. Point-defect production was studied by off-line UV-visible optical spectroscopy after irradiation. For spinel, regardless of both crystal orientation and electron energy, two characteristic broad bands centered at photon energies of 5.4 eV and 4.9 eV were assigned to F and F+ centers (neutral and singly-ionized oxygen vacancies), respectively, on the basis of available literature data. No clear differences in colour-centre formation were observed for the two crystal orientations. Using calculations of displacement cross sections by elastic collisions, these results are consistent with a very large threshold displacement energy (200 eV) for oxygen atoms at RT. A third very broad band centered at 3.7 eV might be attributed either to an oxygen hole center (V-type center) or an F2 dimer center (oxygen di-vacancy). The onset of recovery of these color centers took place at 200°C with almost full bleaching at 600°C. Activation energies (~0.3-0.4 eV) for defect recovery were deduced from the isochronal annealing data by using a first-order kinetics analysis. For ceria, a sub band-gap absorption feature peaked at ~3.1 eV was recorded for 2.5-MeV electron irradiation only. Assuming a ballistic process, we suggest that the latter defect might result from cerium atom displacement on the basis of computed cross sections.},
doi = {10.1088/0953-8984/28/32/325901},
journal = {Journal of Physics. Condensed Matter},
number = 32,
volume = 28,
place = {United States},
year = {2016},
month = {6}
}

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