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Thermal defect annealing of swift heavy ion irradiated ThO 2

Palomares, Raul I. and Tracy, Cameron L. and Neuefeind, Joerg and Ewing, Rodney C. and Trautmann, Christina and Lang, Maik (2017):
Thermal defect annealing of swift heavy ion irradiated ThO 2.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science Publishing, pp. 15-21, 405, ISSN 0168583X,
DOI: 10.1016/j.nimb.2017.05.007,
[Online-Edition: https://doi.org/10.1016/j.nimb.2017.05.007],
[Article]

Abstract

Isochronal annealing, neutron total scattering, and Raman spectroscopy were used to characterize the structural recovery of polycrystalline ThO2 irradiated with 2-GeV Au ions to a fluence of 1 × 1013 ions/cm2. Neutron diffraction patterns show that the Bragg signal-to-noise ratio increases and the unit cell parameter decreases as a function of isochronal annealing temperature, with the latter reaching its pre-irradiation value by 750 °C. Diffuse neutron scattering and Raman spectroscopy measurements indicate that an isochronal annealing event occurs between 275–425 °C. This feature is attributed to the annihilation of oxygen point defects and small oxygen defect clusters.

Item Type: Article
Erschienen: 2017
Creators: Palomares, Raul I. and Tracy, Cameron L. and Neuefeind, Joerg and Ewing, Rodney C. and Trautmann, Christina and Lang, Maik
Title: Thermal defect annealing of swift heavy ion irradiated ThO 2
Language: English
Abstract:

Isochronal annealing, neutron total scattering, and Raman spectroscopy were used to characterize the structural recovery of polycrystalline ThO2 irradiated with 2-GeV Au ions to a fluence of 1 × 1013 ions/cm2. Neutron diffraction patterns show that the Bragg signal-to-noise ratio increases and the unit cell parameter decreases as a function of isochronal annealing temperature, with the latter reaching its pre-irradiation value by 750 °C. Diffuse neutron scattering and Raman spectroscopy measurements indicate that an isochronal annealing event occurs between 275–425 °C. This feature is attributed to the annihilation of oxygen point defects and small oxygen defect clusters.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 405
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: ThO2, Swift heavy Ions, Defects, Neutron total scattering, Raman spectroscopy, Annealing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Dec 2017 09:47
DOI: 10.1016/j.nimb.2017.05.007
Official URL: https://doi.org/10.1016/j.nimb.2017.05.007
Funders: This research is funded by the Office of Basic Energy Sciences of the U.S. Department of Energy as part of the Materials Science of Actinides Energy Frontier Research Center (DE-SC0001089)., The research at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy., R.I.P. gratefully acknowledges support from the U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) through the Carnegie DOE Alliance Center (CDAC) under Grant number DE-NA-0002006.
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