Kinetics of the high temperature oxygen exchange reaction on 238PuO2 powder

Whiting, Christofer E.; Du, Miting; Felker, L. Kevin; Wham, Robert M.; Barklay, Chadwick D.; Kramer, Daniel P.

doi:10.1016/j.jnucmat.2015.10.020

Title: Kinetics of the high temperature oxygen exchange reaction on ²³⁸PuO₂ powder

Journal Article · Fri Oct 23 00:00:00 EDT 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.10.020· OSTI ID:1772653

^[1];

^[2];

^[2]; Barklay, Chadwick D. ^[1]; Kramer, Daniel P. ^[1]

Univ. of Dayton, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this study, oxygen exchange reactions performed on PuO₂ suggest the reaction is influenced by at least three mechanisms: an internal chemical reaction, surface mobility of active species/defects, and surface exchange of gaseous oxygen with lattice oxygen. Activation energies for the surface mobility and internal chemical reaction are presented. Determining which mechanism is dominant appears to be a complex function including at least specific surface area and temperature. Thermal exposure may also impact the oxygen exchange reaction by causing reductions in the specific surface area of PuO₂. Previous CeO₂ surrogate studies exhibit similar behavior, confirming that CeO₂ is a good qualitative surrogate for PuO₂, in regards to the oxygen exchange reaction. Comparison of results presented here with previous work on the PuO₂ oxygen exchange reaction allows complexities in the previous work to be explained. These explanations allowed new conclusions to be drawn, many of which confirm the conclusions presented here.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725; NE0000422; AC0500OR22725

OSTI ID:: 1772653

Alternate ID(s):: OSTI ID: 1252508

Journal Information:: Journal of Nuclear Materials, Vol. 467, Issue 2; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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