• Masengale, Sean
• Aagesen, Larry
• Zhang, Yongfeng
• Hansen, Evan D.
• Harbison, Tim

Abstract

<jats:title>Abstract</jats:title><jats:p>Uranium dioxide (UO<jats:sub>2</jats:sub>) is the primary fuel material that is used in current nuclear reactors. As one of the most fundamental material parameters, grain boundary (GB) energy strongly influences many fuel properties, and the influences depend on the characters and properties of individual GBs. Using molecular dynamics simulations, a high throughput survey of GB energy in UO<jats:sub>2</jats:sub> was carried out for the purpose of elucidating the roles of GB geometry such as misorientation and inclination, as well as the bonding nature of UO<jats:sub>2</jats:sub>, in affecting GB energy. GB energies in CeO<jats:sub>2</jats:sub> were calculated as well for comparison with UO<jats:sub>2</jats:sub> to investigate the generality of GB energy anisotropy in fluorite phase oxides. The results show significant GB energy anisotropy in both UO<jats:sub>2</jats:sub> and CeO<jats:sub>2</jats:sub> that is associated with the cubic symmetry of the fluorite structure. More interestingly, the GB anisotropy is found to be dependent not only on the crystal structure but also the ionic bonding. As such, the GB energy anisotropy in fluorite oxides has significant differences compared with that in fcc metals. The data obtained and the increased knowledge on GB anisotropy will facilitate GB engineering for nuclear fuels with improved properties.</jats:p>

Topics

• impedance spectroscopy
• grain
• phase
• grain boundary
• simulation
• molecular dynamics
• Cerium
• Uranium
• grain boundary energy