Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2

Johnson, J. A.; Rawn, C. J.; Spencer, B. B.; Meisner, R. A.; Del Cul, G. D.

doi:10.1016/j.jnucmat.2017.03.048

Title: Oxidation kinetics for conversion of U₃O₈ to ε-UO₃ with NO₂

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Abstract

The oxidation kinetics of U₃O₈ powder to ε-UO₃ in an NO₂ environment was measured by in situ x-ray diffraction (XRD). Experiments were performed at temperatures of 195, 210, 235, and 250°C using a custom designed and fabricated sample isolation stage. Data were refined to quantify phase fractions using a newly proposed structure for the ε-UO₃ polymorph. The kinetics data were modeled using a shrinking core approach. A proposed two-step reaction process is presented based on the developed models.

Authors:

^[1]; Rawn, C. J. ^[2]; Spencer, B. B. ^[1]; Meisner, R. A. ^[1]; Del Cul, G. D. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Publication Date:: Tue Apr 04 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1408674

Alternate Identifier(s):: OSTI ID: 1419346

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 490; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY

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                    Johnson, J. A., Rawn, C. J., Spencer, B. B., Meisner, R. A., and Del Cul, G. D. Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2.  United States: N. p., 2017. 
Web.  doi:10.1016/j.jnucmat.2017.03.048.

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                    Johnson, J. A., Rawn, C. J., Spencer, B. B., Meisner, R. A., & Del Cul, G. D. Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2.  United States.  https://doi.org/10.1016/j.jnucmat.2017.03.048

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                    Johnson, J. A., Rawn, C. J., Spencer, B. B., Meisner, R. A., and Del Cul, G. D. Tue .  
"Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2".  United States.  https://doi.org/10.1016/j.jnucmat.2017.03.048.  https://www.osti.gov/servlets/purl/1408674.

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@article{osti_1408674,

  title        = {Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2},

  author       = {Johnson, J. A. and Rawn, C. J. and Spencer, B. B. and Meisner, R. A. and Del Cul, G. D.},

  abstractNote = {The oxidation kinetics of U3O8 powder to ε-UO3 in an NO2 environment was measured by in situ x-ray diffraction (XRD). Experiments were performed at temperatures of 195, 210, 235, and 250°C using a custom designed and fabricated sample isolation stage. Data were refined to quantify phase fractions using a newly proposed structure for the ε-UO3 polymorph. The kinetics data were modeled using a shrinking core approach. A proposed two-step reaction process is presented based on the developed models.},

  doi          = {10.1016/j.jnucmat.2017.03.048},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 490,

  place        = {United States},

  year         = {Tue Apr 04 00:00:00 EDT 2017},

  month        = {Tue Apr 04 00:00:00 EDT 2017}

}

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Title: Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2

Abstract

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Title: Oxidation kinetics for conversion of U₃O₈ to ε-UO₃ with NO₂