Polyepitaxial grain matching to study the oxidation of uranium dioxide

doi:10.1038/s41529-024-00479-1

Polyepitaxial grain matching to study the oxidation of uranium dioxide

2024-07-11

1

OA

AI

Darnbrough, James Edward

Eleanor Lawrence Bright

R

Rebecca J. Nicholls

Y

Yadukrishnan Sasikumar

DOI：10.1038/s41529-024-00479-1

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Although the principal physical behaviour of a material is inherently connected to its fundamental crystal structure, the behaviours observed in the real-world are often driven by the microstructure, which for many polycrystalline materials, equates to the size and shape of the constituent crystal grains. Here we highlight a cutting edge synthesis route to the controlled engineering of grain structures in thin films and the simplification of associated 3-dimensional problems to less complex 2D ones. This has been applied to the actinide ceramic, uranium dioxide, to replicate structures typical in nuclear fission fuel pellets, in order to investigate the oxidation and subsequent transformation of cubic UO2 to orthorhombic U3O8. This article shows how this synthesis approach could be utilised to investigate a range of phenomena, affected by grain morphology, and highlights some unusual results in the oxidation behaviour of UO2, regarding the phase transition to U3O8.

Keywords:

LOW-TEMPERATURE OXIDATION

X-RAY

UO2

DIFFUSION

U3O8

DISSOLUTION

BOUNDARIES

CORROSION

BEHAVIOR

Polyepitaxial grain matching to study the oxidation of uranium dioxide

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