6533b7d1fe1ef96bd125c191
RESEARCH PRODUCT
Hardening and formation of dislocation structures in LiF crystals irradiated with MeV–GeV ions
K. SchwartzJanis ManiksChristina TrautmannI. Manikasubject
CrystalNuclear and High Energy PhysicsCrystallographyMaterials scienceAnnealing (metallurgy)Ion trackHardening (metallurgy)IrradiationDislocationInstrumentationIndentation hardnessMolecular physicsAmorphous soliddescription
Abstract Material modifications of LiF crystals irradiated with Au, Pb and Bi ions of MeV to GeV energy are studied by means of microindentation measurements and dislocation etching. Above a critical irradiation fluence of 10 9 ions/cm 2 , the microhardness can improve by a factor of 2 in the bulk and by more than 3 on the surface. Radiation-induced hardening follows the evolution of the energy loss along the ion path. Annealing experiments indicate that complex defect aggregates created in the tracks play a major role for the hardness change. Evidence for severe structural modifications is found when etching indentation impressions in highly irradiated crystals leading to similar pattern as in amorphous or micro-grained materials. Dislocation etching also reveals long-range stress fields extending far beyond the implantation zone deep into the nonirradiated crystal.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-11-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |