Rare Gases in Metals
Using models for fcc and bee metals developed in an earlier paper, the properties of He interstitial and substitutional defects were studied. The He-metal potentials were obtained by a modification of the Wedepohl method. Interstitial activation energies for helium motion are found in general to be quite low, being of the order of 0.5 eV for fcc materials and 0.25 eV for the bcc cases with the exception of palladium (~ 1.7 eV). Substitutional detrapping is found to require an activation energy of from ~2–5 eV, the higher energies found mostly for the bcc materials.
KeywordsHelium Atom Interatomic Potential Interstitial Position Helium Motion Defect Calculation
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