Formation of dislocations in LiF irradiated with 3He and 4He ions
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Date
2018
Authors
Manika, Ilze P.
Zabels, Roberts
Maniks, Janis J.
Schwartz, Kurt
Grants, Rolands
Krasta, T.
Kuzmin, Alexei
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier B.V.
Abstract
Influence of the irradiation with 13.5 MeV 3He and 5 MeV 4He ions on the micro-structure and mechanical properties of LiF single crystals was studied. The depth profiles of nanoindentation, dislocation mobility, selective chemical etching and photoluminescence served for the characterization of damage. Strong ion-induced increase of hardness and decrease in dislocation mobility at the stage of track overlapping due to accumulation of dislocations and other extended defects was observed. At high fluences (1015 ions/cm2) the hardness saturates at about 3.5 GPa (twofold increase in comparison to a virgin crystal) thus confirming high efficiency of light projectiles in modifications of structure and properties. The effects of ion-induced increase of hardness and decrease of dislocation mobility are observed also beyond the ion range and possible mechanisms of such damage are discussed.
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Keywords
Research Subject Categories::NATURAL SCIENCES:Physics , 3He and 4He ions , Damage beyond the ion range , Dislocations , Ion-irradiation , LiF crystals , Nanoindentation , Photoluminescence