Modelling oxygen self-diffusion in UO2 under pressure

Cooper, Michael William D.; Grimes, R. W.; Fitzpatrick, M. E.; Chroneos, A.

doi:10.1016/j.ssi.2015.09.006

Title: Modelling oxygen self-diffusion in UO₂ under pressure

Journal Article · 21 October 2015 · Solid State Ionics

DOI: https://doi.org/10.1016/j.ssi.2015.09.006 · OSTI ID:1296666

Cooper, Michael William D. ^[1]; Grimes, R. W. ^[2]; Fitzpatrick, M. E. ^[3]; Chroneos, A. ^[3]

Imperial College London, London (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Imperial College London, London (United Kingdom)
Coventry Univ., Coventry (United Kingdom)

Access to values for oxygen self-diffusion over a range of temperatures and pressures in UO₂ is important to nuclear fuel applications. Here, elastic and expansivity data are used in the framework of a thermodynamic model, the cBΩ model, to derive the oxygen self-diffusion coefficient in UO₂ over a range of pressures (0–10 GPa) and temperatures (300–1900 K). Furthermore, the significant reduction in oxygen self-diffusion as a function of increasing hydrostatic pressure, and the associated increase in activation energy, is identified.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1296666

Report Number(s):: LA-UR-15-26859

Journal Information:: Solid State Ionics, Journal Name: Solid State Ionics Vol. 282; ISSN 0167-2738

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Diffusion and Dopant Activation in Germanium: Insights from Recent Experimental and Theoretical Results Sgourou, E. N.; Panayiotatos, Y.; Vovk, R. V. Applied Sciences, Vol. 9, Issue 12 https://doi.org/10.3390/app9122454	journal	June 2019
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