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Ab initio study of helium and hydrogen interactions in $\alpha$-Fe

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arxiv 1205.6374 v2 pith:JHHB2EVF submitted 2012-05-29 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords heliumhydrogendensityinteractionironstrongtheoryalpha
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abstract

Density Functional Theory (DFT) calculations show a weak interaction between hydrogen and helium in iron, in contrast to previous reports of a strong trapping of hydrogen at helium. The strong preference of He and H to occupy regions with low electronic density (such as vacancies) explains this discrepancy, with vacancy-He and vacancy-H binding forces concealing the repulsive interaction between He and H. Furthermore, Rate Theory simulations based on our DFT-calculated V$_n$He$_m$H$_p$ cluster energetics predict, as it is observed in some experiments, that synergetic effects could be expected between H and He in iron under irradiation.

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Cited by 1 Pith paper

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  1. Evolution of cavities in BCC-Fe with coexisting H and He under fusion environments

    cond-mat.mtrl-sci 2025-04 conditional novelty 5.0 of 10

    Molecular dynamics and thermodynamic modeling of BCC iron show that coexisting H and He form a core-shell structure in cavities, with He in the core and H on the surface, and that H trapping can persist above 600 K at...

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