Abstract
In the intrinsic temperature range, the study of relative abundances of He in interstitial and single vacancy sites in LiH shows that almost all the gas is trapped in anion vacancies. Our calculated value of the activation energy for migration from an anion vacancy (0.89 eV), when compared with the experimental value of the activation energy (1.22 eV), suggests that the high-temperature migration of He in LiH may be controlled by trapping in the intrinsic defects (vacancy pairs might be important).
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