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Title: Modelling oxygen self-diffusion in UO2 under pressure

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.
Authors:
 [1] ;  [2] ;  [3] ;  [3]
  1. Imperial College London, London (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Imperial College London, London (United Kingdom)
  3. Coventry Univ., Coventry (United Kingdom)
Publication Date:
OSTI Identifier:
1296666
Report Number(s):
LA-UR--15-26859
Journal ID: ISSN 0167-2738
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Volume: 282; Journal ID: ISSN 0167-2738
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS UO2; self-diffusion; pressure