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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5013018· OSTI ID:1470351
 [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
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.
Research Organization:
Energy Frontier Research Centers (EFRC) Washington, D.C. (United States). Materials Science of Actinides (MSA)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357; SC0001089
OSTI ID:
1470351
Alternate ID(s):
OSTI ID: 1420361
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 112; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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