Abstract
Our first-principles density functional theory calculations suggest that the rare earth element Ce has a strong attraction to He (−1.31eV/atom pair) in bcc Fe, even stronger than He–He attraction (−1.18eV). The segregated Ce layer at the He bubble surface could introduce an additional energy barrier (0.40eV) to trespassing He atoms. Therefore, Ce could not only have a pinning effect on mobile He atoms and hence reduce merging rate of He clusters, but also serve as a cover layer to repel further He atoms and thus slows down the bubble growth. The low cost makes Ce a great advantage over Au, which was recently predicted to have similar effect.
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