Thermal defect annealing of swift heavy ion irradiated ThO2

Palomares, Raul I.; Tracy, Cameron L.; Neuefeind, Joerg; Ewing, Rodney C.; Trautmann, Christina; Lang, Maik

doi:10.1016/j.nimb.2017.05.007

Title: Thermal defect annealing of swift heavy ion irradiated ThO₂

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Abstract

Neutron total scattering and Raman spectroscopy were used to characterize the structural recovery of irradiated polycrystalline ThO₂ (2.2 GeV Au, = 1 x 10¹³ ions/cm²) during isochronal annealing. Here, neutron diffraction patterns showed 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.

Authors:

Palomares, Raul I. ^[1]; Tracy, Cameron L. ^[2]; Neuefeind, Joerg ^[3]; Ewing, Rodney C. ^[2]; Trautmann, Christina ^[4]; Lang, Maik ^[1]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Stanford Univ., CA (United States). Dept. of Geological Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS), Chemical and Engineering Materials Division
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Technische Univ. Darmstadt (Germany)

Publication Date:: Fri May 19 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1364316

Alternate Identifier(s):: OSTI ID: 1397664

Grant/Contract Number:: AC05-00OR22725; NA0002006; SC0001089; NA-0002006

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Additional Journal Information:: Journal Volume: 405; Journal Issue: C; Journal ID: ISSN 0168-583X

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ThO2; Swift heavy ions; Defects; Neutron total scattering; Raman spectroscopy; Annealing

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                    Palomares, Raul I., Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, and Lang, Maik. Thermal defect annealing of swift heavy ion irradiated ThO2.  United States: N. p., 2017. 
Web.  doi:10.1016/j.nimb.2017.05.007.

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                    Palomares, Raul I., Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, & Lang, Maik. Thermal defect annealing of swift heavy ion irradiated ThO2.  United States.  https://doi.org/10.1016/j.nimb.2017.05.007

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                    Palomares, Raul I., Tracy, Cameron L., Neuefeind, Joerg, Ewing, Rodney C., Trautmann, Christina, and Lang, Maik. Fri .  
"Thermal defect annealing of swift heavy ion irradiated ThO2".  United States.  https://doi.org/10.1016/j.nimb.2017.05.007.  https://www.osti.gov/servlets/purl/1364316.

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@article{osti_1364316,

  title        = {Thermal defect annealing of swift heavy ion irradiated ThO2},

  author       = {Palomares, Raul I. and Tracy, Cameron L. and Neuefeind, Joerg and Ewing, Rodney C. and Trautmann, Christina and Lang, Maik},

  abstractNote = {Neutron total scattering and Raman spectroscopy were used to characterize the structural recovery of irradiated polycrystalline ThO2 (2.2 GeV Au, = 1 x 1013 ions/cm2) during isochronal annealing. Here, neutron diffraction patterns showed 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.},

  doi          = {10.1016/j.nimb.2017.05.007},

  journal      = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},

  number       = C,

  volume       = 405,

  place        = {United States},

  year         = {Fri May 19 00:00:00 EDT 2017},

  month        = {Fri May 19 00:00:00 EDT 2017}

}

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Title: Thermal defect annealing of swift heavy ion irradiated ThO2

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Title: Thermal defect annealing of swift heavy ion irradiated ThO₂