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Title: Initial stages of ion beam-induced phase transformations in Gd2O3 and Lu2O3

Abstract

The atomic-scale evolution of lanthanide sesquioxides Gd2O3 and Lu2O3 irradiated with 1 MeV Kr ions at room temperature and 120 K, up to fluences of 1x 1016 ions/cm2 (~20 dpa), has been characterized by in situ transmission electron microscopy. At room temperature, both oxides exhibited high radiation tolerance. Irradiation did not cause any observable structural change in either material, likely due to the mobility of irradiation-induced point defects, causing efficient defect annihilation. For Gd2O3, having the larger cation ionic radius of the two materials, an irradiation-induced stacking fault structure appeared at low fluences in the low temperature irradiation. As compared with the cubic-to-monoclinic phase transformations known to result from higher energy (~GeV) ion irradiation, Kr ions of lower energies (~MeV) yield much lower rates of damage accumulation and thus less extensive structural modification. Finally, at a fluence of 2.5 x 1015 ions/cm2, only the initial stages of the cubic-to-monoclinic (C to B) phase transformation process, consisting of the formation and aggregation of defects, have been observed.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. Stanford Univ., CA (United States). Dept. of Geological Sciences
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) Washington, D.C. (United States). Materials Science of Actinides (MSA)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470351
Alternate Identifier(s):
OSTI ID: 1420361
Grant/Contract Number:  
SC0001089; AC07-051D14517; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 7; Related Information: MSA partners with University of Notre Dame (lead); University of California, Davis; Florida State University; George Washington University; University of Michigan; University of Minnesota; Oak Ridge National Laboratory; Oregon state University; Rensselaer Polytechnic Institute; Savannah River National Laboratory; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nuclear (including radiation effects); materials and chemistry by design; synthesis (novel materials); synthesis (self-assembly)

Citation Formats

Chen, Chien-Hung, Tracy, Cameron L., Wang, Chenxu, Lang, Maik, and Ewing, Rodney C. Initial stages of ion beam-induced phase transformations in Gd2O3 and Lu2O3. United States: N. p., 2018. Web. doi:10.1063/1.5013018.
Chen, Chien-Hung, Tracy, Cameron L., Wang, Chenxu, Lang, Maik, & Ewing, Rodney C. Initial stages of ion beam-induced phase transformations in Gd2O3 and Lu2O3. United States. doi:10.1063/1.5013018.
Chen, Chien-Hung, Tracy, Cameron L., Wang, Chenxu, Lang, Maik, and Ewing, Rodney C. Tue . "Initial stages of ion beam-induced phase transformations in Gd2O3 and Lu2O3". United States. doi:10.1063/1.5013018. https://www.osti.gov/servlets/purl/1470351.
@article{osti_1470351,
title = {Initial stages of ion beam-induced phase transformations in Gd2O3 and Lu2O3},
author = {Chen, Chien-Hung and Tracy, Cameron L. and Wang, Chenxu and Lang, Maik and Ewing, Rodney C.},
abstractNote = {The atomic-scale evolution of lanthanide sesquioxides Gd2O3 and Lu2O3 irradiated with 1 MeV Kr ions at room temperature and 120 K, up to fluences of 1x 1016 ions/cm2 (~20 dpa), has been characterized by in situ transmission electron microscopy. At room temperature, both oxides exhibited high radiation tolerance. Irradiation did not cause any observable structural change in either material, likely due to the mobility of irradiation-induced point defects, causing efficient defect annihilation. For Gd2O3, having the larger cation ionic radius of the two materials, an irradiation-induced stacking fault structure appeared at low fluences in the low temperature irradiation. As compared with the cubic-to-monoclinic phase transformations known to result from higher energy (~GeV) ion irradiation, Kr ions of lower energies (~MeV) yield much lower rates of damage accumulation and thus less extensive structural modification. Finally, at a fluence of 2.5 x 1015 ions/cm2, only the initial stages of the cubic-to-monoclinic (C to B) phase transformation process, consisting of the formation and aggregation of defects, have been observed.},
doi = {10.1063/1.5013018},
journal = {Applied Physics Letters},
number = 7,
volume = 112,
place = {United States},
year = {2018},
month = {2}
}

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