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Title: Oxidation kinetics for conversion of U 3O 8 to ε-UO 3 with NO 2

The oxidation kinetics of U 3O 8 powder to ε-UO 3 in an NO 2 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-UO 3 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:
ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
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
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
OSTI Identifier:
1408674
Alternate Identifier(s):
OSTI ID: 1419346

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., Web. doi:10.1016/j.jnucmat.2017.03.048.
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. doi:10.1016/j.jnucmat.2017.03.048.
Johnson, J. A., Rawn, C. J., Spencer, B. B., Meisner, R. A., and Del Cul, G. D.. 2017. "Oxidation kinetics for conversion of U3O8 to ε-UO3 with NO2". United States. doi:10.1016/j.jnucmat.2017.03.048. https://www.osti.gov/servlets/purl/1408674.
@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 = {2017},
month = {4}
}