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Title: Defect accumulation in swift heavy ion-irradiated CeO 2 and ThO 2

Abstract

Here, neutron total scattering was used to investigate defect accumulation mechanisms in CeO 2 and ThO 2 irradiated with 2.2 GeV Au ions. Pair distribution function (PDF) analysis was applied to characterize the local structural evolution and irradiation-induced defects as a function of irradiation fluence. CeO 2 exhibits a greater amount of disorder than ThO 2 under the same irradiation conditions. The local structures of the two materials evolve differently as a function of ion fluence, even if similar defects are produced. The PDF analysis indicates that oxygen dimer and/or peroxide defects with distances of ~1.45 Å are formed in CeO 2, while irradiation-induced defects in ThO 2 result in a change in the mean O–Th–O bond angle and a distortion of local ThO 8 polyhedra. Understanding how bound oxygen defects, such as peroxide, affect bulk oxygen transport in CeO 2 will aid in better predicting and improving properties of fluorite structure materials for fast ion conductor applications.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [2];  [4];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt, Darmstadt (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1410951
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 24; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Palomares, Raul I., Shamblin, Jacob, Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, and Lang, Maik. Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2. United States: N. p., 2017. Web. doi:10.1039/c7ta02640d.
Palomares, Raul I., Shamblin, Jacob, Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, & Lang, Maik. Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2. United States. doi:10.1039/c7ta02640d.
Palomares, Raul I., Shamblin, Jacob, Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, and Lang, Maik. Tue . "Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2". United States. doi:10.1039/c7ta02640d.
@article{osti_1410951,
title = {Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2},
author = {Palomares, Raul I. and Shamblin, Jacob and Tracy, Cameron L. and Neuefeind, Joerg and Ewing, Rodney C. and Trautmann, Christina and Lang, Maik},
abstractNote = {Here, neutron total scattering was used to investigate defect accumulation mechanisms in CeO2 and ThO2 irradiated with 2.2 GeV Au ions. Pair distribution function (PDF) analysis was applied to characterize the local structural evolution and irradiation-induced defects as a function of irradiation fluence. CeO2 exhibits a greater amount of disorder than ThO2 under the same irradiation conditions. The local structures of the two materials evolve differently as a function of ion fluence, even if similar defects are produced. The PDF analysis indicates that oxygen dimer and/or peroxide defects with distances of ~1.45 Å are formed in CeO2, while irradiation-induced defects in ThO2 result in a change in the mean O–Th–O bond angle and a distortion of local ThO8 polyhedra. Understanding how bound oxygen defects, such as peroxide, affect bulk oxygen transport in CeO2 will aid in better predicting and improving properties of fluorite structure materials for fast ion conductor applications.},
doi = {10.1039/c7ta02640d},
journal = {Journal of Materials Chemistry. A},
issn = {2050-7488},
number = 24,
volume = 5,
place = {United States},
year = {2017},
month = {5}
}

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