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Our first-principles density functional theory calculations suggest that therare earth element, Ce, has a stronger attraction (-1.31eV) to He than He-He(-1.18eV) in bcc Fe. Consequently, the mobile He atoms could be pinned to Ce,and hence a reduced merging of He clusters. Moreover, we find that thesegregated Ce layer at the He bubble surface presents an energy barrier of 0.33eV to the upcoming He atom and thus slows down the bubble growth.

Impeding effect of cerium on the growth of helium bubble in iron