Article ID Journal Published Year Pages File Type
1296242 Solid State Ionics 2015 5 Pages PDF
Abstract

•Oxygen self-diffusion over a range of temperatures and pressures is important in UO2.•The UO2 bulk modulus as a function of T and P is expressed in a single equation.•The cBΩ model is used to derive the oxygen self-diffusion with respect to P in UO2.•Advancing proliferation-resistant technologies to harvest the energy potential of spent fuel.

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). The significant reduction in oxygen self-diffusion as a function of increasing hydrostatic pressure, and the associated increase in activation energy, is identified.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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