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First-principles Modelling of Radiation Defects in Advanced Nuclear Fuels

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 266(12-13):2671-2675
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We present and discuss the results of the first-principles calculations of Frenkel defects and O impurities in uranium mononitride (UN) perspective for fast reactor nuclear fuels. Special attention is paid to the calculation of defect migration energies. We demonstrate that the interstitialcy mechanism (with the formation of a N–N dumbbell along the [111] axis) is energetically more favorable than the direct [100] hops. As a result, for the interstitial N ions we predict a diffusion mechanism similar to that known in isostructural fcc materials with a different chemical nature (KCl, MgO). The calculated effective N charge considerably depends on the ion position and environment (a host lattice site, interstitial or saddle point) which strongly limits the applicability of classical defect modelling based on formal invariant charges. Lastly, the calculated migration energy for the interstitial impurity O ions is quite low (2.84 eV), which indicates their high mobility and ability for reactions with other defects.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1010486
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 266(12-13):2671-2675, Journal Name: Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 266(12-13):2671-2675
Country of Publication:
United States
Language:
English

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Environmental Molecular Sciences Laboratory